多項(xiàng)選擇題

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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單項(xiàng)選擇題

Which view should a user query to display the columns associated with the constraints on a table owned by the user?（）

A.USER_CONSTRAINTS
B.USER_OBJECTS
C.ALL_CONSTRAINTS
D.USER_CONS_COLUMNS
E.USER_COLUMNS

多項(xiàng)選擇題

Evaluate the SQL statement
DROP TABLE DEPT;
Which four statements are true of the SQL statement? （）

A.You cannot roll back this statement.
B.All pending transactions are committed.
C.All views based on the DEPT table are deleted.
D.All indexes based on the DEPT table are dropped.
E.All data in the table is deleted, and the table structure is also deleted.
F.All data in the table is deleted, but the structure of the table is retained.
G.All synonyms based on the DEPT table are deleted.

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Which three statements about subqueries are true? （）

你可能感興趣的試題

Which view should a user query to display the columns associated with the constraints on a table owned by the user?（）

Evaluate the SQL statement DROP TABLE DEPT; Which four statements are true of the SQL statement? （）

Evaluate the SQL statement
DROP TABLE DEPT;
Which four statements are true of the SQL statement? （）