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T-SQL: Comparing 2 tables

when comparing 2 tables, is there a way to return the spicific column that changed?
Currently I am successfully comparing the tables using this code:
SELECT MIN(TableName) AS TableName, RateNumber, UpdatedBy, UpdatedOn
	FROM
	(
 
	SELECT 'Current Data' AS TableName, tar_number AS RateNumber, tar_updateby AS UpdatedBy, tar_updateon AS UpdatedOn
	FROM tariffheader
 
	  UNION ALL
 
	SELECT 'Original Snapshot' AS TableName, RateNumber, UpdatedBy, UpdatedOn
	FROM TarrifSnapshotTemp
	) tmp
 
	GROUP BY RateNumber, UpdatedBy, UpdatedOn
	HAVING COUNT(*) = 1
	ORDER BY RateNumber

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pablo_munoz
Asked:
pablo_munoz
  • 2
1 Solution
 
imitchieCommented:
SELECT MIN(TableName) AS TableName, RateNumber, UpdatedBy, UpdatedOn,
 case when min(RateNumber) <> max(RateNumber) then 'YES' else '' end as RateNumberChanged,
 case when min(UpdatedBy) <> max(UpdatedBy) then 'YES' else '' end as UpdatedByChanged,
 case when min(UpdatedOn) <> max(UpdatedOn) then 'YES' else '' end as UpdatedOnChanged
        FROM
        (
 
        SELECT 'Current Data' AS TableName, tar_number AS RateNumber, tar_updateby AS UpdatedBy, tar_updateon AS UpdatedOn
        FROM tariffheader
 
          UNION ALL
 
        SELECT 'Original Snapshot' AS TableName, RateNumber, UpdatedBy, UpdatedOn
        FROM TarrifSnapshotTemp
        ) tmp
 
        GROUP BY RateNumber, UpdatedBy, UpdatedOn
        HAVING COUNT(*) = 1
        ORDER BY RateNumber
0
 
imitchieCommented:
Actually, can you please explain
"currently I am successfully comparing the tables using this code"

What is it successfully doing? It looks like it's showing you the rows that exist only in Current or Shapshot.  Is there an ID that links them together?
0
 
pablo_munozAuthor Commented:
Actually it's the same data, I don't have the ability to add a trigger to the table that I need to check, so instead I am selecting the data into a temp table, once I have a snapshot of the current data, I can then compare the two tables and check for differences. if there is a difference, I email the concerned party. I also update the temp table if there is a difference.
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