Single T-SQL query to swapping the values of two columns without using temporary column


How to swap the values of two columns of a table ?

Let me explain the scenario with an example –

Let’s create a table named “Employees” with columns “First_Name” and “Last_Name”. Then populate the table with some fictitious data. Then view the results once and then interchange the values in the “First_Name” and “Last_Name” columns of the table. Then see the results in the table again to verify. The below T-SQL does all this:

Interchanging column values in a table
Interchanging column values in a table

Usually the UPDATE statement as in the above picture gives the impression of the both columns returning the same set of values (here Last_Name column values in both columns). But SQL Server behaves intelligent and interchanges the values in the two columns. It internally stores the values in a temporary column and then does the interchange.

Hope you enjoyed reading this post and found somewhat interesting learning. Keep coming back or follow this “Data Language” blog for more such interesting posts.

Happy time until my next blog post.. 🙂

 

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