It is said that "Viagra”()() magical powers that can cure impotence.
A. has
B. exaggerates
C. develops
D. yields
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It is said that "Viagra”()() magical powers that can cure impotence. A
A. has
B. exaggerates
C. develops
D. yields
要删除mytable表中的myindex索引，可以使用（ ）语句。
A. Delete INDEX mytable.myindex
B. Delete mytable.myindex
C. DROP myindex
DROP INDEX mytable.myindex
关于索引的作用,最完整的说法是( )
A. 便于管理
B. 提高查询速度
C. 节省存储空间
D. 提高查询和更新速度
下列哪个联接谓词的含义是指,确定指定列的值或表达式的值是否与子查询或列表中的值相匹配。( )
A. all
B. any
C. in
D. exists
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