【单选题】删除表s中字段c的SQL命令是
A.
ALTER TABLE s DELETE c
C.
DELETE TABLE s DELETE c
【单选题】老年人动脉管壁硬化,大动脉的弹性储器作用减弱所以
【单选题】删除表S中字段C的SQL命令是( )。A.ALTER TABLE s DELETE c B.ALTER TABLE s DROP c. ##
A.
删除表S中字段C的SQL命令是( )。 A.ALTER TABLE s DELETE c
C.
DELETE TABLE s DELETE c
【单选题】删除表S中字段C的SQL命令是()。
A.
ALTER TABLE s DELETE c
C.
DELETE TABLE s DELETE c
【单选题】老年人动脉管壁硬化,大动脉的弹性储器作用减弱,所以