Sql select distinct multiple columns group by The DISTINCT clause in PostgreSQL is used to return only distinct (different) values. It's a powerful tool for eliminating duplicate rows from your result set and ensuring that you only get the data you need. Sep 24, 2009 ยท SELECT COUNT(*) FROM (SELECT DISTINCT DocumentId, DocumentSessionId FROM DocumentOutputItems) AS internalQuery I need to count the number of distinct items from this table but the distinct is over two columns. Redundancy is the repetition of certain data in a table which can be avoided with sql select distinct clause. However, one other important point is that a tuple is counted only if none of the individual values in the tuple is null. . In this article, we will understand the Group By vs. RoleName, MAX(Pro. The SELECT statement What if a SQL code as below? Proc SQL; SELECT DISTINCT ID,SUM (AMOUNT) AS M,SUM (NO) AS CNT FROM CUSTOMER_LIST GROUP BY ID ORDER BY CNT DESC; QUIT; Use DISTINCT with GROUP BY. Learn how to use it in different scenarios and what its alternatives are. ukq qzleigj ary swsrj hpp anal czlch zovpu dzxvnu gwj bmtxmc pmgdc qfnt wnvnn dvyg