單項選擇題可以在創(chuàng)建表時用()來創(chuàng)建唯一索引,也可以用()來創(chuàng)建唯一索引
A.Create table,Create index
B.設(shè)置主鍵約束,設(shè)置唯一約束
C.設(shè)置主鍵約束,Create index
D.以上都可以
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1.單項選擇題刪除經(jīng)銷商1018的數(shù)據(jù)記錄的代碼為()from distributors where distri_num=1018
A.droptable
B.delete*
C.dropcolumn
D.delete
2.單項選擇題以下刪除記錄正確的()
A.delete from emp where name=’dony’;
B.Delete * from emp where name=’dony’;
C.Drop from emp where name=’dony’;
D.Drop * from emp where name=’dony’;