多项选择题
A.Asinglerowsubquerycanretrieveonlyonecolumnandonerow.
B.Asinglerowsubquerycanretrieveonlyonerowbutmanycolumns.
C.Amultiplerowsubquerycanretrievemultiplerowsandmultiplecolumns.
D.Amultiplerowsubquerycanbecomparedusingthe"；>；"；operator.
E.AsinglerowsubquerycanusetheINoperator.
F.Amultiplerowsubquerycanusethe"；="；operator.
单项选择题 Which view should a user query to display the columns associated with the constraints on a table owned by the user?（）
多项选择题 Evaluate the SQL statement DROP TABLE DEPT; Which four statements are true of the SQL statement? （）
单项选择题 Which SQL statement generates the alias Annual Salary for the calculated column SALARY*12?（）