How to update date column to be last day of the month

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SQL-Server-2012

Hi,
How do I update the value of the entire column to the last day of the month.
for example. Currently its 2015-09-01. Update to 2015-09-30.
Just an FYI - I have more than 500 dates to update.

Posted 16-Sep-15 6:31am

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[no name] 16-Sep-15 12:55pm

How is about to use Google?
https://www.google.ch/#q=mssql+last+day+of+the+month[^]
I'm for 99% sure you will find an answer.

Quote: "Just an FYI - I have more than 500 dates to update": I don't hope you think this 500 is something like "a lot of rows" ;)

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Wendelius · Answer 1 · 2015-09-16T07:34:00

Solution 1

If all the row values contain the first day of some month, just add one month and go back one day. So something like

SQL

UPDATE TableName
SET DateColumn = DATEADD(month, 1, DateColumn ) - 1;

For more information, see DATEADD[^]

Posted 16-Sep-15 7:34am

Wendelius

Richard Deeming · Answer 2 · 2015-09-16T08:38:00

Solution 2

Since you're using SQL 2012, you can use the new EOMONTH[^] function:

SQL

UPDATE YourTable
SET YourColumn = EOMONTH(YourColumn)

Posted 16-Sep-15 8:38am

Richard Deeming