use命令的含义是改变当前要操作的数据库。

A.USE db_student;

B.OPEN db_student;

C.SELECT db_student;

D.USE DATABASE db_student;

A.Esc

B.Ctrl+A

C.Ctrl+X

D.Ctrl+X

A.IN TEST

B.SHOW TEST

C.USER TEST

D.USE TEST

A.SHOW DATABASE;

B.SHOW DATABASES;

C.list DATABASES;

D.use DATABASES;