sql not a group by expression

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Serena
14 Oct 2019
1SELECT a, b, sum(c) FROM my_table GROUP BY a;		-- Error
2SELECT a, b, sum(c) FROM my_table GROUP BY a, b;	-- OK, all expressions there
3-- CASE WHEN statement, for example:
4SELECT a, CASE WHEN b=1 THEN 'Ok' ELSE 'Ko' END AS r, sum(c) 
5FROM my_table
6GROUP BY a, CASE WHEN b=1 THEN 'Ok' ELSE 'Ko' END;		-- No alias name (r)
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