题目内容

在sql语言中,有关索引描述正确的是()

A. index普通索引
B. primary key主键索引
C. unique 唯一索引
D. count统计索引

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A. order by
B. where
C. limit
D. group by

A. ('201009','111',60,'必修')
B. ('200823','101',NULL,NULL)
C. (NULL,'103',80,'选修')
D. ('201132',NULL,86,'101')

A. DB
B. DBMS
C. DBS
DML

A. Master
B. TEMPDB
C. Model
D. MSDB