你可能喜欢
多项选择题
A.Truncate table 可跟Where从句,根据条件进行删除
B.Truncate table 用来删除表中所有数据
C.触发器对Truncate table无效
D.delete 比Truncate table速度快
多项选择题
A.SELECT * FROM 学习经历 WHERE 毕业学校 LIKE ’*清华*’
B.SELECT * FROM 学习经历 WHERE 毕业学校 = ’清华%’
C.SELECT * FROM 学习经历 WHERE 毕业学校 LIKE ’?清华?’
D.SELECT * FROM 学习经历 WHERE 毕业学校 LIKE ’%清华%’
多项选择题
A.Select * from [order details] Order by quantity desc
B.Select * from [order details] Order by quantity asc
C.Select * from [order details] Order by quantity
D.Select * from [order details] Order by desc quantity
多项选择题
A.SELECT * FROM Products WHERE UnitPrice >= 20 OR UnitPrice <= 40
B.SELECT * FROM Products WHERE UnitPrice BETWEEN 20 OR 40
C.SELECT * FROM Products WHERE UnitPrice >= 20 AND UnitPrice <= 40
D.SELECT * FROM Products WHERE UnitPrice BETWEEN 20 AND 40
多项选择题
A.SELECT Product Name AS’产品的名称’,Unit Price AS’单价’FROM Products
B.SELECT Product Name=产品的名称,Unit Price=单价FROM Products
C.SELECT Product Name=“产品的名称”,Uni tPrice=“单价”FROM Products
D.SELECT Product Name’产品的名称’,Unit Price’单价’FROM Products
多项选择题
A.SELECT productname,price from products order by price ASC
B.SELECT productname,price from products order by price DESC
C.SELECT productname,price from products order by price
D.SELECT productname and price from products order by price DESC
多项选择题
A.select * from table_name where 1<=2
B.truncate table table_name
C.delete from table_name where null=null
D.alter table table_name add column idd int
多项选择题
A.HAVING子句必须与GROUPBY子句同时使用,不能单独使用
B.使用HAVING子句的同时不能使用WHERE子句
C.使用HAVING子句的同时可以使用WHERE子句
D.使用HAVING子句的作用是限定分组的条件