问题:
A . A WHERE clause can be used to restrict both rows and groups.
B . A WHERE clause can be used to restrict rows only.
C . A HAVING clause can be used to restrict both rows and groups.
D . A HAVING clause can be used to restrict groups only.
E . A WHERE clause CANNOT be used in a query if the query uses a HAVING clause.
F . A HAVING clause CANNOT be used in subqueries.
● 参考解析
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