SELECT * FROM customer ORDER BY cust, cust_id FETCH FIRST 2 ROWS ONLY; In this SQL, ALL rows qualify the query, so DB2 fetches all of the rows, then sorts them, then sends first 2 rows to client. A question about mixing the (relatively new) “fetch first” syntax with “select for update” appeared a few days ago on the Oracle Developer Forum. Howto select first value in a group by bunch of rows.... Hi TomI have just begun using analytic functions, but have come up short on this:In a query where I group by a field, I would like to select the first values from a specific row.I have using something like: select distinct a.name , first_value(c.task) over (partit row_number () returns a row’s position within its window. I don’t know why you’re seeing that result but there is one tiny clue. Area SQL General; Contributor Mike Hichwa (Oracle) Created Thursday October 15, 2015 In 19.3 it’s only operation 4 that reports E-rows = 202. An example query would look like this: SELECT customer_id, revenue FROM customer_revenue ORDER BY … In the outer subquery, we select only the … After applying this APAR fix, … The requirement was for a query something like: select * from t1 order by n1 fetch first 10 rows only for update ; How to make a join between two tables but limiting to the first row that meets the join condition ? ... this is really simple. .Here is a review of the fetch top-n SQL methods in Oracle: Row Limit plan: This Oracle 12c new feature offset x fetch first y rows only makes it easy to display the first n rows from a table. In order to get the FETCH FIRST n ROWS ONLY semantics, we can use ROW_NUMBER(): 11 . In some applications, you execute queries that can return a large number of rows, but you need only a small subset of those rows. In Oracle, just replace ROWS ONLY by ROWS WITH TIES: 11 . In your case, both queries give same results because first 2 rows are already ordered by cust and cust_id. In this simple example, I would like to get for every row in table_A the first row from table_B that satisfies the condition : select table_A.id, table_A.name, table_B.city from table_A join table_B on table_A.id = table_B.id2 where .. To find the top 1 row in Oracle SQL, you can use the FETCH parameter and specify FETCH FIRST 1 ROWS ONLY. over (partition by user_id order by created_at desc specifies a sub-table, called a window, per user_id, and sorts those windows by created_at desc. The E-rows column varies with version for this query – for 12.1.0.2 and 12.2.0.1 the E-rows column reports 202 rows for operations 2, 3 and 4. Prior to Oracle 12c, we were constrained by these methods: Thus the first widget for each user_id will have row_number 1. That is the method that we discuss below. 4 FETCH FIRST 5 PERCENT ROWS ONLY); COUNT(*)-----5 Cool, now it is working :) ... 1 DB_ULTRA_SAFE 1 DML Redirection 1 DNS 1 FETCH 1 Failover 1 FlashBack 1 Grid Control 1 KVM 1 LDAP 1 LogMiner 1 OOW 1 OOW17 1 ORA-03113 1 OpenWorld 1 Oracle Internet Directory 1 Oracle OpenWorld 2017 1 Orphan 1 PRCA-1002 1 PRCR-1028 1 PRCR-1072 1 PXE 1 Privilege 1 … The loop is designed in such a way that it processes first one row and comes out. CREATE TABLE TEST.T1( C1 INT ,C2 INT ); SELECT DISTINCT C FROM ( SELECT C1 AS C FROM TEST.T1 UNION ALL SELECT C2 AS C FROM TEST.T1 ) AS T FETCH FIRST 3 ROWS ONLY; DB2 does not process the FETCH FIRST clause properly which may result in different access path. 1. Christian, Thanks for raising the problem. As long as your ORDER BY clause shows how you want to order your data, it will work. 1. FETCH FIRST n ROWS ONLY clause is used for fetching a limited number of rows. 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