“Song of the Guerrillas” was composedin the year of _______ .
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“Battle Song for Strengthening the Military” was composed in the year of _______ .
以下聚合函数求数据平均值的是()。
A. MAX
B. COUNT
C. SUM
D. AVG
select语句中的完整语法较复杂,但至少包括的部分是()。
A. selelct,from
B. select,group
C. select,order
D. select,into
若要删除数据库中已经存在的表S,可用()。
A. DELETE TABLE S
B. DELETE S
C. DROP S
DROP TABLE s