题目
A. MGRID EMPCOUNT ----- -------- 1 0 2 2 5 1
B. MGRID EMPCOUNT ----- -------- 1 0 2 2 3 0 4 0 5 1
C. MGRID EMPCOUNT ----- -------- 1 3 2 3 3 3 4 3 5 3
D. MGRID EMPCOUNT ----- -------- 1 0 2 2 3 2 4 2 5 1
第1题
A.alter table employee drop constraint df_email
B.alter table employee remove constraint df_email
C.alter table employee delete constraint df_email
D.remove constraint df_email from table employee
第2题
A.Alter table employee drop df_email
B.Alter table employee remove df_email
C.Alter table employee delete df_email
D.remove df_email from table employee
第3题
A.alter table employee drop constraint df_email
B.alter table employee remove constraint df_email
C.alter table employee delete constraint df_email
D.remove constraint df_email from table employee
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