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Mixing Group Functions with Non-group Selection Fields in SQL Server
Can Group Functions Be Mixed with Non-group Selection Fields in SQL Server?
✍: FYIcenter.com
If a group function is used in the SELECT clause, all other selection fields must be group level fields. Non-group fields can not be mixed with group fields in the SELECT clause. The script below gives you an example of invalid SELECT statements with group and non-group selection fields mixed in a SELECT statement:
SELECT COUNT(*), url FROM fyi_links GO Msg 8120, Level 16, State 1, Line 1 Column 'fyi_links.url' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause. SELECT 2*COUNT(*), 2*counts FROM fyi_links GO Msg 8120, Level 16, State 1, Line 1 Column 'fyi_links.counts' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
In these examples, COUNT(*) is a group field and "url"/"2*counts" is a non-group field. The error message also tells that "url"/"counts" is not an aggregate function (group function).
2016-10-25, 651👍, 0💬
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