SQL.我该怎么写NOT LIKE语句

Question

SELECT       *
FROM            [Table]
WHERE        (Izdava NOT LIKE NULL)

//如何检查Izdava是否为NULL

Answer 1

这应该工作:

SELECT * FROM [Table] WHERE Izdava IS NOT NULL

Answer 2

SELECT * FROM [Table] WHERE (Izdava IS NOT NULL)

Answer 3

我想这就是你想要的.

SELECT * 
FROM [Table] 
WHERE Izdara Is Not NULL

有关MSDN中NULL值的信息:

以下是有关空值的信息:

要在查询中测试空值,请在WHERE子句中使用IS NULL或IS NOT NULL.

Answer 4

LIKE NULL毫无意义.这没有意义. LIKE用于比较使用通配符的部分字符串或不带通配符的完整字符串.

根据您想要的RDBMS不是NULL,

SELECT * FROM [Table] WHERE (NOT Izdava IS NULL)