Compare deleted and inserted table in SQL Server 2008

Question

I am new to SQL Server 2008 and I need advice from all of you. I want to find out the changed value in inserted and deleted tables of the SQL Serve

Answer 1

You could make a dynamic "comparer" by converting the inserted and deleted tables into 2 xml, iterating through the properties and comparing the xml value.

Example:

CREATE TRIGGER MY_COMPARER
   ON TABLE_NAME
   AFTER UPDATE
AS
BEGIN
    DECLARE @columnIndex INT = 1;
    DECLARE @maxColumns INT = (select count(*) from INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'TABLE_NAME');
    DECLARE @insertedXML XML = (select top 1 * from INSERTED FOR XML PATH('ROOT'), ELEMENTS XSINIL);
    DECLARE @deletedXML XML = (select top 1 * from DELETED FOR XML PATH('ROOT'), ELEMENTS XSINIL);

    WHILE @columnIndex <= @maxColumns BEGIN 
        DECLARE @insertedXMLValue XML = (select @insertedXML.query('/ROOT/*[sql:variable("@columnIndex")]'));
        DECLARE @deletedXMLValue XML = (select @deletedXML.query('/ROOT/*[sql:variable("@columnIndex")]'));

        DECLARE @insertedValue NVARCHAR(MAX) = CONVERT(NVARCHAR(MAX), @insertedXMLProp);
        DECLARE @deletedValue NVARCHAR(MAX) = CONVERT(NVARCHAR(MAX), @deletedXMLProp);

        IF (@insertedValue != @deletedValue)
            print('Column: ' + CONVERT(NVARCHAR(MAX), @columnIndex) + ' has changed')

        SET @columnIndex = @columnIndex + 1;
    END
END