T-sql - determine if value is integer

Question

I want to determine if a value is integer (like TryParse in .NET). Unfortunatelly ISNUMERIC does not fit me because I want to parse only integers a

Answer 1

With sqlserver 2005 and later you can use regex-like character classes with LIKE operator. See here.

To check if a string is a non-negative integer (it is a sequence of decimal digits) you can test that it doesn't contain other characters.

SELECT numstr
  FROM table
 WHERE numstr NOT LIKE '%[^0-9]%'

Note1: This will return empty strings too.

Note2: Using LIKE '%[0-9]%' will return any string that contains at least a digit.

See fiddle