sql-server - 选择无法转换的行

Question

在我的表的一列中存储了房屋地址的编号。

不幸的是，我以前的同事不喜欢思考，所以他们制作了类型列varchar并且没有阻止软件上的输入......所以现在我被一堆房屋/公寓数量为“NI”的行困住了、“Not Info”、“Unknown”等，而不是一个有意义的数字......

我只想选择不是数字的行......类似select * from table where CAST(column as int)抛出异常

Answer 1

Take a look at IsNumeric, IsInt, IsNumber, you can't use just isnumeric it will return true for - signs and other stuff like that

For example, this returns 1

SELECT ISNUMERIC('2d5'),
       ISNUMERIC('+')

Answer 2

select * from table where ISNumeric(column)=0 

but it may give false positives .....

Answer 3

Try this:

SELECT * FROM table WHERE ISNUMERIC(column + 'e0') = 0

Answer 4

Create a function that that tries the cast and any other logic that you needs then return 0 if the value doesn't meet your requirements if it succeeds return 1. then use the function in the where clause