明天考,问一下shyu1:
Which three statements about subqueries are true? (Choose three.)
(是不是BCE?)
A.
A single row subquery can retrieve only one column and one row.
B.
A single row subquery can retrieve only one row but many columns.
C.
A multiple row subquery can retrieve multiple rows and multiple columns.
D.
A multiple row subquery can be compared using the ">" operator.
E.
A single row subquery can use the IN operator.
F.
A multiple row subquery can use the "=" operator.