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查看11 | 回复2 | 2005-10-30 17:05:33 | 显示全部楼层 |阅读模式
Which two statements about subqueries are true? (Choose two.)
A. A single row subquery can retrieve data from only one table.
B. A SQL query statement cannot display data from table B that is referred to in its
subquery, unless table B is included in the main query's FROM clause.
C. A SQL query statement can display data from table B that is referred to in its
subquery, without including table B in its own FROM clause.
D. A single row subquery can retrieve data from more than one table.
E. A single row subquery cannot be used in a condition where the LIKE operator is used
for comparison.
F. A multiple-row subquery cannot be used in a condition where the LIKE operator is
used for comparison.
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千问 | 2005-10-30 17:05:33 | 显示全部楼层
I will choose B and E.
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千问 | 2005-10-30 17:05:33 | 显示全部楼层
a bit confused
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