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Which three statements about subqueries are true? （）
A:Asinglerowsubquerycanretrieveonlyonecolumnandonerow.
B:Asinglerowsubquerycanretrieveonlyonerowbutmanycolumns.
C:Amultiplerowsubquerycanretrievemultiplerowsandmultiplecolumns.
D:Amultiplerowsubquerycanbecomparedusingthe"；>；"；operator.
E:AsinglerowsubquerycanusetheINoperator.
F:Amultiplerowsubquerycanusethe"；="；operator.

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出自：Oracle认证

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