单选题

已知tm_employee表中具有默认约束df_adress，删除该约束的...

Question

已知tm_employee表中具有默认约束df_adress，删除该约束的语句为（）

A. alter talbe tm_employee drop constraint df_adress

B. alter talbe tm_employee remove constraint df_adress

C. alter talbe tm_employee delete constraint df_adress

D. remove constraint df_adress from talbe tm_employee