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Editorial Team
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Asked: 2026-05-13T15:20:42+00:00

I need a fast way duplicate a DATETIME column in a table and give

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I need a fast way duplicate a DATETIME column in a table and give it a new name.

I have a column named myDate in my table called myResults, I need a query to make a new column in the table called newDate which has the exact same data as the myDate column.

Is there a faster way to do this than by doing the obvious 2 step approach of make a new column, and then copying all the data (it’s a large table and I’m looking for the fastest approach)?

Obvious solution: 

 ALTER TABLE `myResults` ADD `newDate` DATETIME;  
 UPDATE `myResults` SET `newDate` = `myDate`;
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1 Answer

  1. Editorial Team

    The obvious solution is the only solution, unfortunately.

    However note that in general you shouldn’t be copying a column in relational databases.

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