SQL Server Update Trigger, Get Only modified fields

Question

I am aware of COLUMNS_UPDATED, well I need some quick shortcut (if anyone has made, I am already making one, but if anyone can save my time, I will appriciate i

Answer 1

I transformed the accepted answer to get list of column names separated by comma (according to author's recommendation). Output - "Columns_Updated" as 'Column1,Column2,Column5'

-- get names of updated columns
DECLARE @idTable      INT
declare @ColumnName nvarchar(300)
declare @ColId int

SELECT  @idTable = T.id 
FROM    sysobjects P JOIN sysobjects T ON P.parent_obj = T.id 
WHERE   P.id = @@procid

DECLARE @changedProperties nvarchar(max) = ''

DECLARE @Columns_Updated VARCHAR(2000) = ''

DECLARE @maxByteCU INT
DECLARE @curByteCU INT
SELECT  @maxByteCU = DATALENGTH(COLUMNS_UPDATED()), 
        @curByteCU = 1

WHILE @curByteCU <= @maxByteCU BEGIN
    DECLARE @cByte INT
    SET     @cByte = SUBSTRING(COLUMNS_UPDATED(), @curByteCU, 1)

    DECLARE @curBit INT
    DECLARE @maxBit INT
    SELECT  @curBit = 1, 
            @maxBit = 8
    WHILE @curBit <= @maxBit BEGIN
        IF CONVERT(BIT, @cByte & POWER(2, @curBit - 1)) <> 0 BEGIN
            SET @ColId = cast( CONVERT(VARCHAR, 8 * (@curByteCU - 1) + @curBit) as int)

            select @ColumnName = [Name]
            FROM syscolumns 
            WHERE id = @idTable and colid = @ColId

            SET @Columns_Updated = @Columns_Updated + ',' + @ColumnName
        END
        SET @curBit = @curBit + 1
    END
    SET @curByteCU = @curByteCU + 1
END