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Counting Groups Returned with the GROUP BY Clause in SQL Server
How To Count Groups Returned with the GROUP BY Clause in SQL Server?
✍: FYIcenter.com
If you use the COUNT(*) function on groups returned with the GROUP BY clause, it will count the number of rows within each group, not the number of groups. If you want to count the number of groups, you can put the GROUP BY query into a subquery and apply the COUNT(*) function on the main query as shown in the following tutorial exercise:
SELECT tag AS Category, YEAR(created) AS Year, COUNT(*) AS Counts FROM fyi_links GROUP BY tag, YEAR(created) GO Category Year Counts SQA 2003 1 DEV 2004 1 DBA 2005 1 DBA 2006 1 DEV 2006 1 DBA 2007 1 SQA 2007 1 SELECT COUNT(*) FROM ( SELECT tag AS Category, YEAR(created) AS Year, COUNT(*) AS Counts FROM fyi_links GROUP BY tag, YEAR(created) ) groups GO 7
⇒Using SELECT Statements with Joins and Subqueries in SQL Server
2016-10-29, 669👍, 0💬
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