查询以从SQL Server中的字符串返回子字符串

Question

I have a user defined function called Sync_CheckData under Scalar-valued functions in Microsoft SQL Server. What it actually does is to check the quantity of issued product and balance quantity are the same. If something is wrong, returns an ErrorStr nvarchar(255) .

Output Example:

Balance Stock Error for Product ID : 4

From the above string, I want to get 4 so that later on I can SELECT the rows which is giving errors by using WHERE clause ( WHERE Product_ID = 4 ).

Which SQL function can I use to get the substring ?

Answer 1

Try this

DECLARE @STR AS VARCHAR(1000)
SELECT @STR='Balance Stock Error for Product ID : 4'

SELECT substring(@STR,charINDEX(':',@STR)+1,LEN(@STR)-charINDEX(':',@STR)+1)

Answer 2

I'd use RIGHT for this:

declare @response varchar(100)
set @response = 'Balance Stock Error for Product ID : 4'

select right(@response, len(@response) - charindex(':', @response))

Sample fiddle: http://sqlfiddle.com/#!3/d41d8/16397 (altered from above)

Answer 3

Try this

DECLARE @String VARCHAR(100)

SET @String = 'Balance Stock Error for Product ID : 4'

SELECT RIGHT(@string, CHARINDEX(':', REVERSE(@string))-2)

OR

SELECT RIGHT(@string,(LEN(@string)+1)-PATINDEX('%[0-9]%', @string))