hive select last 10 rowshive select last 10 rows

In the above example, five aggregations were performed over the single column anon_id. Specify the window frames relation to the current row (e.g. You can apply functions to the returned data. 03-15-2018 Composes a result set from one or more table references. Speeding up : select "n" rows from a view (select * from view limit n) without any filter condition. Sign Up page again. In general, a SELECT query scans the entire table (other than for sampling). from test Clouderas new Model Registry is available in Tech Preview to connect development and operations workflows, [ANNOUNCE] CDP Private Cloud Base 7.1.7 Service Pack 2 Released, [ANNOUNCE] CDP Private Cloud Data Services 1.5.0 Released. If OPTIMIZE FOR n ROWS is not specified, n in FETCH FIRST n ROWS ONLY is used as OPTIMIZE FOR n ROWS for access path selection. WebROW_NUMBER () is a windowing function so it needs to be used in conjunction with an OVER clause. expression A combination of one or more values, operators, and SQL functions that evaluates to a We have a set of analysts who perform : "select * from view limit n" kind of queries many times. from_unixtime takes an integer and converts it into a recognizable Timestamp string, There are various date part functions which will extract the relevant parts from a Timestamp string. OPTIMIZE FOR 1 ROW to avoid sorts: You can influence the access path most by using OPTIMIZE FOR 1 ROW. Feel free to add more in the comments section. But that was 10+ years ago and she still runs hard today. For the next couple of examples, well use the table below. Heres our selection of eight articles that give your learning journey an extra boost. This is the sum of 5 mm precipitation from September 1st, 15 mm from the 2nd, and 10 mm from the 3rd. You can use different mathematical functions , collection functions, type conversion functions, date functions, conditional functions or string functions. Unfortunately, the group by clause will not accept alias. How to select record from last 6 months in a news table using MySQL? try this select id,name,age,modified from test WebSELECT anonid, fueltypes, acorn_type FROM geog_all; Simple selections: row selection. Created 10-06-2016 The following sentence will return all name in upper case. Heres one more thing to note: The order of records in the window frame has a key role in specifying which rows to consider. Applies to: Databricks SQL Databricks Runtime. The purpose of the ROWS clause is to specify the window frame in relation to the current row. I hope you might have enjoyed the article. Select cast (floatval as double) from floattest. The number of new subscribers added on the last day. In Hive, querying data is performed by a SELECT statement. This takes at most two parameters. An index that matches the ORDER BY clause is more likely to be picked. Related To re-iterate what @mqureshi already noticed, your query does not seem functionally correct. "db_name.table_name" allows a query to access tables in different databases. February 27, 2023 at 10:15 pm. The predicates by which the rows produced by GROUP BY are filtered. Webhive> select * from stu; OK Lucy 22 Time taken: 0.074 seconds, Fetched: 1 row(s) insert overwrite insert overwrite table stu select * from . 1 create table stu01(name string) partitioned by(age int) row format delimited fields terminated by ','; 2insert into when calculating running totals). No clue about hiveql, but I guess you should be able to modify row_number () to have it order by descending order. WebThe Hive Query Language (HiveQL) is a query language for Hive to process and analyze structured data in a Metastore. The old girl has definitely earned her spot in history, and Im so proud to be a little part of it. Thanks so much for reading! certain values or ranges within one or more columns. Update and delete statements modify and delete values already written to Hive. Here, we have used LIMIT clause. Since all analysts/BI users come from traditional RBDMS background, users do compare the waiting time for RDBMS and for Hive Query to return results. Hives Reserved Keywords Hive 0.13 Query Returns Unexpected Null Results Time Pushdown Limitation Timezone Parsing Limitation The OPTIMIZE FOR n ROWS clause lets an application declare its intent to do either of these things: DB2 uses the OPTIMIZE FOR n ROWS clause to choose access paths that minimize the response time for retrieving the first few rows. ; n PRECEDING n rows Note, Hive supports SELECT DISTINCT * starting in release 1.1.0 (HIVE-9194). It contains fictional data on average temperature (in C) and total precipitation (in mm) in two Italian cities (Rome and Florence) over five consecutive days. The following query returns 5 arbitrary customers, The following query returns the first 5 customers to be created, The following query returns the 3rd to the 7th customers to be created. 1. For an example, see Common Table Expression. Aggregate functions are used to perform some kind of mathematical or statistical calculation across a group of rows. WHERE clause works similar to a condition. Join our monthly newsletter to be notified about the latest posts. If DISTINCT is specified the function collects only unique values and is a synonym for collect_set aggregate function. We have a set of analysts who perform : "select * from view limit n" kind of queries many times. However, there will be times when we really do need to be able to treat the column as a Timestamp. ALL and DISTINCT Clauses The ALL and DISTINCT options specify whether duplicate rows should be returned. We use the SUM() function to calculate the total level of precipitation for the last three days, including the current day. 1 a 11 2012 {"serverDuration": 84, "requestCorrelationId": "a3e59ef7b471c1a5"}, Supporting Quoted Identifiers in Column Names, Sort By / Cluster By / Distribute By / Order By, http://www.fileformat.info/tool/regex.htm. As i have got only 2 records because there are 2 records in the table that are having 2018-03-15 as date in daily column and we have used to_Date function it will extract only the date from timestamp. Optionally prunes columns or fields from the referencable set of columns identified in the select_star clause. 10-07-2016 If you specify HAVING without GROUP BY, it indicates a GROUP BY without grouping expressions (global aggregate). This change requires a restart. These cookies do not store any personal information. If present limits the columns to be named to those in the specified referencable table. This syntax allows users to perform analysis that requires aggregation. Clouderas new Model Registry is available in Tech Preview to connect development and operations workflows, [ANNOUNCE] CDP Private Cloud Base 7.1.7 Service Pack 2 Released, [ANNOUNCE] CDP Private Cloud Data Services 1.5.0 Released. Finally, we define the window frame as UNBOUNDED PRECEDING to include all records up to the current one inclusively. Then you can just select the rows with rank=1. These features are provided by Spark SQL. a set of rows). Open Sourcing Clouderas ML Runtimes - why it matters to customers? It is mandatory to procure user consent prior to running these cookies on your website. LATERAL VIEW applies the rows to each original output row. It includes daily information on the number of new subscribers across three social networks: Instagram, Facebook, and LinkedIn. When you create a new column it is usual to provide an alias for the column. What is not allowed is specifying a nonaggregated column in the select clause which is not mentioned in the group by clause. If any response in this thread was helpful, don't forget to vote/accept the best response. Open Sourcing Clouderas ML Runtimes - why it matters to customers? NOTE:- To enforce the values set by you for the variable "myvar" above method can be used. In this lesson, we will start with the very simple and work our way up to the more complex. OPTIMIZE FOR n ROWS is effective only on queries that can be performed incrementally. They started at 8 am and broke for lunch at 12. Please enter your registered email id. Its a great way to build on your window functions knowledge. In this article, well focus on the ROWS clause and its options. 1=1 is true, but null=null is false. Hints help the Databricks SQL optimizer make better planning decisions. I understand that mechanism of Hive (with Tez) and Hive (with MR) is different from traditional RDBMS databases. See the following documents for additional syntax and features of SELECT statements: Powered by a free Atlassian Confluence Open Source Project License granted to Apache Software Foundation. How to select rows in MySQL that are >= 1 DAY from the current date? The Expression in the where clause can be more complex and involve more than one column. 1. i think An inner join between the same table twice with limit 1 will solve this issue . To practice defining window frames, check out this interactive Window Functions course with 200+ coding challenges. We want to calculate the three-days moving average temperature separately for each city. Notice that the columns used in the conditions of the Where clause dont have to appear in the Select clause. WebFind tickets for ANGEL, Escape the Hive, Taz Taylor Band, Smegma showing at the Whisky A Go Go - West Hollywood, US Friday Apr 28, 6:00PM Tickets starting at $25.00 In addition to the standard SELECT options, Delta tables support the time travel options described in this section. You follow it, Coleman said. Practically, you do one full table scan for that and once you get those three records you do another table scan to get the attributes of those records. If one of your bounds is a current row, you can skip specifying this bound and use a shorter version of the window frame definition: Ordering the records in the window frame by date (the default is in ascending order), since the order of rows matters when calculating a running total. Interested in how SQL window functions work? After going through the above examples, hopefully you have the motivation to learn SQL window functions and the ROWS options more thoroughly. Can be supplied in the form of a string or cell reference. Drop us a line at contact@learnsql.com, SQL Window Function Example With Explanations. It is just an OPTIMIZER Directive to choose the optimized path and the limit of the result set lies with the WHERE clause. 06:25 PM. If you want to get really comfortable with window functions, I recommend LearnSQL.coms interactive Window Functions course. In the elec_c and gas_c tables, the advance DateTime column, although it contains timestamp type information, it is defined as a string type. To get the current database (as of Hive 0.13.0), use the current_database() function: To specify a database, either qualify the table names with database names ("db_name.table_name"starting inHive 0.7) or issue the USE statement before the query statement (starting inHive 0.6). On the first day, it equals the sales from this day $1515.45; on the second day, it equals the sum of sales from the first and second days $3860.80; in the next row, we get the sum of sales from the first three days $4764.79, etc. For example, to query version 123 for the table events, specify events@v123. Number of rows can be retrieved with OPTIMIZE FOR n ROWS: The OPTIMIZE FOR n ROWS clause does not prevent you from retrieving all the qualifying rows. In this example, well calculate the total precipitation for the last three days (i.e. Create a data file (for our example, I am creating a file with comma-separated fields) Upload the data file (data.txt) to HDFS. Sequential prefetch is less likely to be requested by DB2 because it infers that you only want to see a small number of rows. When a FILTER clause is attached to an aggregate function, only the matching rows are passed to that function. Want to start with some reading first? Retrieving the entire result table NOTE: Views are created only on static values, even if it is null or empty. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. How to select all rows from a table except the last one in MySQL? If you specify a value for n that is anything but 1, DB2 chooses an access path based on cost, and you wont necessarily avoid sorts. The following statement will get the data from column name and all the columns starting with the prefix address. No question that this could work, just a bit concerned with performance. Execute the following command : show tables in DB like 'TABLENAME' If the table exists, its name will be returned, otherwise nothing will be returned. How to retrieve Latest Uploaded records from Hive , In my table dont DATE column , Only Modified Timestamp Column only Available ? Now i want to find latest upload date , In that date how many records are uploaded ? To return only the rows of the employee table for those 20 employees, you can write a query like this. SQL window functions are tremendously useful for calculating complex aggregations like moving averages or running totals. Give this a try: select t1.* from test t1 Created on for more options see this.. DB is the database in which you want to see if the table exists. 05:18 AM. How Do You Write a SELECT Statement in SQL? SELECT statement is used to retrieve the data from a table. 10-06-2016 08:55 AM. In our final example, I want to demonstrate how we can display the first and the last value of a specific set of records using window functions and the ROWS clause. For now, the mapred.reduce.tasks property is still recognized, and is converted to To separate the calculations for the two cities, well include the PARTITION BY clause. Have you tried LLAP/Interactive Queries? The following query will return rows which column name contains the words "smith" or "son". Created The syntax for accessing the last record from the Oracle database is given below: SELECT Column_Name FROM Table_Name ORDER BY Column_Name DESC WHERE ROWNUM <=1; In this Oracle syntax, we have to specify the ROWNUM keyword, which is less than and equal to 1. @Constantin Stanca, Find answers, ask questions, and share your expertise. Now lets move on to some new data and examples. An expression with an optional assigned name. unix_timestamp returns the current data and time as an integer! For example, if table page_views is partitioned on column date, the following query retrieves rows for just days between 2008-03-01 and 2008-03-31. I'm not sure about my data because here even composite keys can produce duplicates. For ORDER BY, however, it does make it more likely that an index will be used, even one with a low cluster ratio, to avoid the sort if n is small (1 or 12 for example). If you have also defined a descending index on column SALARY, that index is likely to be very poorly clustered. NOTE: One can workaround this problem by setting the property "hive.security.authorization.sqlstd.confwhitelist.append" at customer hiveserver2-site via Ambari or in the xml file. In Oracle, the ROWNUM keyword Web. In our next examples, well see how the ROWS clause works when the records are divided into several groups. Then, we use the PARTITION BY clause to compute separate calculations for each network. Until next time, Bill  How many joins, formats of underlying table, where clauses etc. A reference to a field in a column of the set of columns that you can reference. WebThe Hive provides various in-built functions to perform mathematical and aggregate type operations. Neither do you need to write each clause on a new line, but it is often clearer to do so for all but the simplest of queries. TABLENAME is the table name you seek,. In Presto Catalog, enter the catalog of the target table to be authorized, for example, hive.. Performing SELECTs based on session variables; Creating VIEWS based on the variable (Same as in HiveCLI), Executing multiple statements using variable at session level, Multiple statements can be executed in the beeline by modifying the session variable at runtime in the same way as with Hive CLI. Hive supports a number of operators and UDFs in the WHERE clause: As of Hive 0.13 some types of subqueries are supported in the WHERE clause. In older versions of Hive it is possible to achieve the same effect by using a subquery, e.g: The LIMIT clause can be used to constrain the number of rows returned by the SELECT statement. The running total is calculated separately for each network, as specified in the window function. Scenario: Suppose that you write an application that requires information on only the 20 employees with the highest salaries. This will follow a few articles in which we will cover more advanced functions and queries. FETCH FIRST n ROWS ONLY or LIMIT clauses are used for fetching a limited number of rows. 7. The following is the syntax to get the last 10 records from the table. Hive can insert data into multiple tables by scanning the input data just once (and applying different query operators) to the input data. To avoid many random, synchronous I/O operations, DB2 would most likely use a tablespace scan, then sort the rows on SALARY. In order to limit the number of rows given in result, you can use the LIMIT keyword. As of Hive 0.13.0, FROM is optional (for example, SELECT 1+1). Select all matching rows from the table references. Heres the SQL query to get the required output: As you see, we are using the FIRST_VALUE() and the LAST_VALUE() functions to get the information on the first and the last days, respectively. It shows you how to compute running totals and running averages, build different types of rankings, investigate trends across time, and more. What actually happens is that 10-07-2016 The various Hive DML commands are: LOAD SELECT INSERT DELETE UPDATE EXPORT IMPORT Let us now learn each DML command About this task In some applications, you execute queries that can return a large number of rows, but you need only a small subset of those rows. We dont include the ROWS clause with the FIRST_VALUE() function because the default behavior (i.e. MySQL select query to select rows from a table that are not in another table. 10-06-2016 LAST_VALUE. SELECT * FROM db.view limit 10 Takes the following times to complete via hive over Knox or via Ambari View or with beeline.run 1: 36 seconds run 2: 18 seconds run 3: 38 seconds .This is one example of a db/table combination, but this is a common scenario for mostly all the tables in a few databases. Affordable solution to train a team and make them project ready. Labels: Apache Hive WebThe following query skips the first 10 products with the highest level of inventory and returns the next 10 ones: SELECT product_name, quantity FROM inventories INNER JOIN products USING (product_id) ORDER BY quantity DESC OFFSET 10 ROWS FETCH NEXT 10 ROWS ONLY; Code language: SQL (Structured Query Language) (sql) At the same time limiting the columns returned by a query, additionally you can limit the returned rows. In addition to using operators to create new columns, there are also many Hive builtin functions that can be used. It is better to practice, and generally more efficient to explicitly list the column names that you want to be returned. Select all rows except from today in MySQL? This time, lets add two columns to the output: With this information calculated separately for each social network, we can see how every days performance compares to where weve started and where we are now. You use familiar insert, update, delete, and merge SQL statements to query table data. When running the same query through Hive over Knox (or even with beeline), it takes much higher time. However, if you use OPTIMIZE FOR n ROWS, the total elapsed time to retrieve all the qualifying rows might be significantly greater than if DB2 had optimized for the entire result set. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. OPTIMIZE FOR n ROWS: When an application executes a SELECT statement, DB2 assumes that the application will retrieve all the qualifying rows. WebWhen the dust settles after Vancouver City Council approves its amendments to the City of Vancouvers 2023 operating budget, the average property tax hike for residents and businesses this year could reach 10.7%. I understand that, we are not comparing apple to apple here, but this question is more to do with improvement of end user experience, and how best can we help to avoid long wait times? The ALL and DISTINCT options specify whether duplicate rows should be returned. The timestamp must be in yyyyMMddHHmmssSSS format. Created Create schemas. Each name must reference a column included in the set of columns that you can reference or their fields. In the query above, we have ordered the records in the window frame by date in ascending order (using the default setting), i.e. Hive provides a variety of date related functions to allow you to convert strings into Timestamp and to additionally extract parts of the Timestamp. You can specify a version after @ by prepending a v to the version. The Calgary Flames have a mountain to scale if they hope to climb into the 2023 Stanley Cup Playoffs. This is essentially the name you wish to give to the new column. All of the clause names above have been written in uppercase for clarity. The following is an example. Scroll down to see our SQL window function example with definitive explanations! Learn why data scientists and data analysts should master SQL window functions, one of the most powerful tools to help solve complex query challenges. As of September 3rd, we get a three-day running total of precipitation in Florence: 30 mm. 10-07-2016 However, it's your query and you probably know more about it, so you can ignore my comment if you know what I am talking about. is the protected brand of Scrum.org. Order By OrderDate. Nested loop join is the most likely choice because it has low overhead cost and appears to be more efficient if you want to retrieve only one row. Shouldn't you be using the hivevar namespace everywhere instead of the hiveconf namespace? Hive supports tables up to 300PB in Optimized Row Columnar (ORC) format. hive.security.authorization.sqlstd.confwhitelist.append=myvar. Do you know how we got the 12 mm running total for Rome on Sep 5th? But opting out of some of these cookies may affect your browsing experience. The simplest case is to say how many rows are wanted using the Limit clause. This link describes usage of ROW_NUMBER() for SQL 2005 but it's the same for Hive. Then, on September 2nd, the moving average is calculated as the average temperature for the 1st and 2nd (17.5 C in Florence and 18.8 C in Rome, respectively). You must reference it explicitly. gr Notify me of follow-up comments by email. I understand that mechanism of Hive(with Tez) and Hive (with MR) is different from traditional RDBMS databases. There's a nearly undocumented feature of Hive SQL (I found it in one of their Jira bug reports) that lets you do something like argmax() using stru The qualifying rows different databases Knox ( or even with beeline hive select last 10 rows, takes! To return only the matching rows are passed to that function and to additionally extract of. A string or cell reference is usual to provide an alias for the variable `` myvar '' method. ) is different from traditional RDBMS databases concerned with performance in general, select... A nonaggregated column in the select_star clause is specifying a nonaggregated column in the file... 5 mm precipitation from September 1st, 15 mm from the table think an join! No question that this could work, just a bit concerned with performance )! This article, well use the table below following query retrieves rows for just days between 2008-03-01 and.! Specify the window frame as UNBOUNDED PRECEDING to include all records up to 300PB in optimized row Columnar ( )... My table dont date column, only Modified Timestamp column only Available Bill & nbsp ; how joins. Line at contact @ learnsql.com, SQL window functions course `` myvar '' method. Only the matching rows are wanted using the hivevar namespace everywhere instead of the of... Rows on SALARY the highest salaries table using MySQL, delete, and generally efficient. It needs to be requested by DB2 because it infers that you want to get data... Provides various in-built functions to allow you to convert strings into Timestamp and additionally... The result set lies with the prefix address wish to give to the data... Language for Hive to process and analyze structured data in a news table MySQL! Conditions of the target table to be named to those in the xml file requires aggregation clause which is mentioned! News table using MySQL data from column name and all the qualifying rows hiveconf namespace the... Forget to vote/accept the best response you be using the hivevar namespace everywhere instead of the target table to returned... I guess you should be able to modify row_number ( ) function calculate. Only the matching rows are wanted using the limit keyword divided into several groups the new it! Name and all the qualifying rows calculated separately for each network, as in! That index is likely to be very poorly clustered through Hive over (... Optimizer Directive to choose the optimized path and the rows clause is more likely to be.! In the comments section namespace everywhere instead of the rows to each original output.! Of 5 mm precipitation from September 1st, 15 mm from the 2nd, and generally more to! For those 20 employees with the highest salaries want to calculate the total precipitation the. That are not in another table that the columns to be used got the 12 running... Check out this interactive window functions and queries more columns ) from floattest 5 mm from! A nonaggregated column in the select clause which is not mentioned in the window function example with definitive Explanations a! And merge SQL statements to query version 123 for the last three (. Procure user consent prior to running these cookies on your window functions and.. More likely to hive select last 10 rows authorized, for example, well calculate the three-days moving average temperature separately for network... For the last three days, including the current row ( e.g limited of! Choose the optimized path and the rows to each original output row order limit! Beeline ), it takes much higher time 200+ coding challenges delete statements modify and delete values written! Or empty the application will retrieve all the columns to be returned to! Into several groups webrow_number ( ) to have it order by clause is to how! Clause is attached to an aggregate function using the limit clause choose the optimized path and the limit of where. 2008-03-01 and 2008-03-31 then you can specify a version after @ by prepending a v to the new column is! Using operators to create new columns, there will be times when we really do need to be to... To specify the window function example with Explanations, there will be times when we really need... Allows a query Language ( hiveql ) is different from traditional RDBMS databases for! Very simple and work our way up to 300PB in optimized row Columnar ORC! For collect_set aggregate function how do you know how we hive select last 10 rows the 12 mm total! For example, five aggregations were performed over the single column anon_id data... Moving averages or running totals to enforce the values set by you for the events! Query version 123 for the next couple of examples, well calculate three-days... At 12 September 1st, 15 mm from the table below index likely... Describes usage of row_number ( ) is different from traditional RDBMS databases which we will cover more advanced and. Having without group by are filtered upload date, in my table date! And she still runs hard today parts of the set of columns that you can specify a version @. Question that this could work, just a bit concerned with performance statement is used perform... On only the rows clause and its options on static values, even it. ( other than for sampling ) values already written to Hive, 15 mm the... However, there will be times when we really do need to be very clustered. Written to Hive that this could work, just a bit concerned with performance Stanca, find,... Of the hiveconf namespace Catalog of the rows with rank=1 a Metastore to process and analyze structured data a... Enjoy unlimited access on 5500+ Hand picked Quality Video Courses above have been in! Will cover more advanced functions and the limit clause by are filtered hard.., to query table data notice that the columns starting with the FIRST_VALUE ( for... Is less likely to be returned we have a set of columns in... The hivevar namespace everywhere instead of the Timestamp each name must reference a column included in the select.... This will follow a few articles in which we will cover more advanced functions and the rows the. A few articles in which we will start with the prefix address all rows from table! Is different from traditional RDBMS databases supplied in the form of a string or cell reference way up to in... The table: select `` n '' kind of mathematical or statistical calculation across group! Ambari or in the group by, it indicates a group by are filtered for at. To add more in the window frame as UNBOUNDED PRECEDING to include all records up to current. And examples the very simple and work our way up to the complex. N ) without any filter condition scale if they hope to climb into the 2023 Stanley Cup Playoffs for! Work our way up to the more complex the FIRST_VALUE ( ) function to calculate hive select last 10 rows... A reference to a field in a column of the clause names hive select last 10 rows. Update, delete, and LinkedIn specify a version after @ by prepending a v to the.! Helpful, do n't forget to vote/accept the best response the PARTITION by clause will not alias! Select_Star clause we have a set of columns that you can write a query for... Requires information on the rows clause is to specify the window frame as UNBOUNDED PRECEDING include! By DB2 because it infers that you can just select the rows clause with prefix. Group of rows table twice with limit 1 will solve this issue optimized row Columnar ( ORC ).... At 8 am and broke for lunch at 12 names that you want to calculate the total precipitation for last... Only want to get really comfortable with window functions knowledge clause is to. To enforce the values set by you for the next couple of examples, well focus on the last days... Up: select `` n '' kind of mathematical or statistical calculation across a group of.! Complex and involve more than one column ( with Tez ) and (. ( ORC ) format well use the PARTITION by clause to compute separate calculations for network... Like moving averages or running totals lunch at 12 or cell reference type operations of. Work, just a bit concerned with performance are filtered specify the window frames relation the. To have it order by clause to compute separate calculations for each network, as specified the. For example, if table page_views is partitioned on column SALARY, that index likely! Those in the where clause dont have to appear in the set analysts. And Hive ( with MR ) is a query to select rows from a view ( select * view. Information on the rows on SALARY 1+1 ) limit 1 will solve this.... * starting in release 1.1.0 ( HIVE-9194 ) index that matches the order by descending order days... You create a new column it is better to practice, and merge SQL statements query... The 20 employees with the FIRST_VALUE ( ) is a synonym for collect_set aggregate.. Version after @ by prepending a v to the current day requested by DB2 because it infers that you a. Table events, specify events @ v123 index on column SALARY, that index is likely be! To be very poorly clustered limited number of new subscribers added on the rows with rank=1 querying data performed. Frame in relation to the version by which the rows clause works when the records are divided into groups.

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