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Posted Jan 4, 2006

By Muthusamy Anantha Kumar aka The MAK

As we all know, SQL Server 2005 has new features whencompared to SQL Server 2000. One of the features that we are going to discussin this article is the Row_Number() function. SQL Server Database administratorsand developers have been longing for this function for a long time--now thewait is over.

Traditionally developers and Database administrators usedtemporary tables and co-related sub-queries to generate calculated row numbersin a query. Now SQL Server 2005 provides a function, which replaces all of theadditional resources we used to generate row numbers.

Let us assume that we have the following database[EMPLOYEE TEST] and the following table [EMPLOYEE] in the database. You can usethe below query to create the database, table and all the corresponding rows.

Let usbrowse the table Employee by using the following SQL Query.

Theresults of the above query look like illustration 1.0.

Traditionallyin SQL Server 2000, in order to create row numbers based on the rows availablein a table, we used to use the following query.

Thisquery created a new table using the identity function in order to generate RowId.

Let usquery the table by using the following query.

Theresults of the above query would look like illustration 1.1.

In thisillustration it is clear that the table has a duplicate row with EMPID =2021110.

To deletethe duplicate row with EMPID = 2021110, we have to delete the row in employee2table and I cannot delete the duplicate row directly from the Employee table.

SQLServer 2005 provides a new function, Row_Number(), for generating row numbers.In order to delete the duplicate row from the original table we can use thefeatures, Common Table Expression and Row_Number() together.

Let usgenerate the ROWID using the Row_Number() function based on EMPID.

Theresults of the above query would look like illustration 1.2.

In thisresult set, we can identify the duplicate row for the EMPID 2021110.

Let usdisplay the duplicate row using the Common Table expression and Row_Number()function by using the following query.

Theresults of the above query would look like illustration 1.3.

Thisduplicate row can be deleted using the Common Table expression and Row_Number()function by using the following query.

Let usquery the table using the following query.

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Theresults of the above query would look like illustration 1.4.

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In this illustration,we can see that the duplicate row has been deleted.

Conclusion

In thisarticle, we have discussed the new features of Row_Number() function and CommonTable Expression and used both the features together to delete duplicate rows.

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