SQL Server, where field is int?

Question

how can I accomplish:

select * from table where column_value is int

I know I can probably inner join to the system tables and type tables b

Answer 1

Here if you want to implement your custom function

CREATE Function dbo.IsInteger(@Value VARCHAR(18))
RETURNS BIT
AS 
BEGIN    
     RETURN ISNULL(     
         (SELECT    CASE WHEN CHARINDEX('.', @Value) > 0 THEN 
                            CASE WHEN CONVERT(int, PARSENAME(@Value, 1)) <> 0  THEN 0  ELSE 1 END  
                    ELSE 1 
                    END      
          WHERE     ISNUMERIC(@Value + 'e0') = 1), 0)

END

ISNUMERIC returns 1 when the input expression evaluates to a valid integer, floating point number, money or decimal type; otherwise it returns 0. A return value of 1 guarantees that expression can be converted to one of these numeric types.