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 … Area SQL General; Contributor Mike Hichwa (Oracle) Created Thursday October 15, 2015 After applying this APAR fix, … 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. Prior to Oracle 12c, we were constrained by these methods: The requirement was for a query something like: select * from t1 order by n1 fetch first 10 rows only for update ; 1. I have a cursor in oracle database which would be fetching thousands of rows in a sorted manner but I would actually need only the first row (i.e., oldest one first). The loop is designed in such a way that it processes first one row and comes out. Christian, Thanks for raising the problem. 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 In your case, both queries give same results because first 2 rows are already ordered by cust and cust_id. Retrieving the entire result table from the query can be inefficient. In the outer subquery, we select only the … In 19.3 it’s only operation 4 that reports E-rows = 202. row_number () returns a row’s position within its window. In some applications, you execute queries that can return a large number of rows, but you need only a small subset of those rows. Thus the first widget for each user_id will have row_number 1. 1. Script Name fetch first X rows only, new 12c SQL syntax; Description With database 12c you can limit your SQL query result sets to a specified number of rows. And then the cursor is opened again to fetch the remaining rows. I don’t know why you’re seeing that result but there is one tiny clue. In Oracle, just replace ROWS ONLY by ROWS WITH TIES: 11 . .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. ... this is really simple. 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. To find the top 1 row in Oracle SQL, you can use the FETCH parameter and specify FETCH FIRST 1 ROWS ONLY. FETCH FIRST n ROWS ONLY clause is used for fetching a limited number of rows. How to make a join between two tables but limiting to the first row that meets the join condition ? As long as your ORDER BY clause shows how you want to order your data, it will work. 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. An example query would look like this: SELECT customer_id, revenue FROM customer_revenue ORDER BY … That is the method that we discuss below. 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. In order to get the FETCH FIRST n ROWS ONLY semantics, we can use ROW_NUMBER(): 11 . 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