对数据表进行修改的语句正确的是( ) 。
A.alter table employee add memo B.alter table employee drop column age C.alter table employee add column D.alter table employee drop age正确答案BD
对数据表进行修改的语句正确的是( ) 。
A.alter table employee add memo B.alter table employee drop column age C.alter table employee add column D.alter table employee drop age正确答案BD