How to Compare Rows and Columns in SQL Server Database?

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Khushi Singh · Answer

The process of SQL Server database comparison includes both dataset analysis for identifying missing records as well as the detection of changes within column values. Your requirements determine which approach you should use to achieve row and column comparison in an SQL Server database.
You can perform table row comparison with JOINs or through the use of
EXCEPT and INTERSECT or with FULL OUTER JOIN. An
INNER JOIN locates pairs while LEFT JOIN and RIGHT JOIN show which records do not match. This operation allows viewing data rows that exist within one database but not in the other. articles that exist between both tables appear during an INTERSECT operation. A FULL OUTER JOIN provides valuable results about unmatching records along with any absent data across both tables in the analysis.
The CASE statement enables row-wise value comparison inside SELECT statements when checking for different values between columns from the same table. Entire row comparisons become efficient when you use
CHECKSUM() or HASHBYTES() function which generates hash values for both tables.
A FULL OUTER JOIN connection with the use of ISNULL() or
COALESCE() helps identify differences in particular table column values between two databases. The PIVOT operator functions as a tool to evaluate multiple columns as they span across diverse rows.
To work with large datasets the process becomes more efficient by indexing important table columns alongside using automated comparison tools through SQL Server Data Compare.

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How to Compare Rows and Columns in SQL Server Database?

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