If you have two separate tables with same primary key and want to check the updates in the other table,using BINARY_CHECKSUM would be the best answer. But need to careful about column data types. Column Data types shouldn't be text, ntext, image, XML, and cursor.
Here is T-SQL query to compare two rows from different table:
Take ORDERS1 as one table and ORDERS2 as other table
SELECT ORDERS1.PRIMARYKEY_ID
FROM
(SELECT PRIMARYKEY_ID, BINARY_CHECKSUM(*) AS CHECKVALUE FROM ORDERS1) AS CHECKSUMTABLE1
INNER JOIN
(SELECT PRIMARYKEY_ID, BINARY_CHECKSUM(*) AS CHECKVALUE FROM ORDERS2) AS CHECKSUMTABLE2
ON CHECKSUMTABLE1.PRIMARYKEY_ID= CHECKSUMTABLE2.PRIMARYKEY_ID
WHERE CHECKSUMTABLE1.CHECKVALUE <> CHECKSUMTABLE2.CHECKVALUE
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