A. Delete from emp where name='dony'; B. Delete * from emp where name='dony'; C. Drop from emp where name='dony'; Drop * from emp where name='dony';
A. select count(*) from user; B. select count(id) from user; C. select count(username) from user; D. select count(1) from user;
A. Order By 工资 B. Order By 工资 Desc C. Order By 工资 Asc D. Order By 工资 Dictinct
A. SELECT SNO FROM SC GROUP BY SNOWHERE COUNT（*）> 3 B. SELECT SNOFROM SC GROUP BY SNOHAVING COUNT（*）> 3 C. SELECT SNOFROM SC ORDER BY SNOWHERE COUNT（*）> 3 D. SELECT SNOFROM SC ORDER BY SNOHAVING COUNT（*）> 3
A. 使用聚合函数 B. Where条件判断 C. 使用IN运算符 D. 使用Group by进行分组
A. 对 B. 错
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