多項選擇題

Where can subqueries be used?（）

A.field names in the SELECT statement
B.the FROM clause in the SELECT statement
C.the HAVING clause in the SELECT statement
D.the GROUP BY clause in the SELECT statement
E.the WHERE clause in only the SELECT statement
F.the WHERE clause in SELECT as well as all DML statements

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多項選擇題

Which two statements are true regarding the USING and ON clauses in table joins?（）

A.Both USING and ON clauses can be used for equijoins and nonequijoins
B.Amaximum of one pair of columns can be joined between two tables using the ON clause
C.The ON clause can be used to join tables on columns that have different names but compatible data types
D.The WHERE clause can be used to apply additional conditions in SELECT statements containing the ON or the USING clause

單項選擇題

Which statement is true regarding the INTERSECT operator?（）

A.It ignores NULL values
B.Reversing the order of the intersected tables alters the result
C.The names of columns in all SELECT statements must be identical
D.The number of columns and data types must be identical for all SELECT statements in the query