TRIM is not a recognized built-in function name

Question

For the following code:

DECLARE @ss varchar(60)
  SET @ss = 'admin'

  select TRIM(@ss)

I've got an error:

'TRIM' is not a recognized built-in function name

Answer 1

TRIM is introduced in SQL Server (starting with 2017).

In older version of SQL Server to perform trim you have to use LTRIM and RTRIM like following.

DECLARE @ss varchar(60)
  SET @ss = ' admin '

  select RTRIM(LTRIM(@ss))

If you don't like using LTRIM, RTRIM everywhere, you can create your own custom function like following.

   CREATE FUNCTION dbo.TRIM(@string NVARCHAR(max))
    RETURNS NVARCHAR(max)
     BEGIN
      RETURN LTRIM(RTRIM(@string))
     END
    GO