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Constraint Violating Yak Guru

332 Posts

Posted - 08/15/2014 :  14:10:51  Show Profile  Reply with Quote
I have a table with date column and need to delete the data more than 30 days old.

I tried this script but getting error

DELETE table WHERE MsgDate < Datediff(dd, 30, Getdate())

Conversion failed when converting the varchar value '2014-08-15' to data type int.

how do i convert this varchar to int? thanks

Almighty SQL Goddess

38200 Posts

Posted - 08/15/2014 :  14:19:04  Show Profile  Visit tkizer's Homepage  Reply with Quote
You need to use DATEADD, not DATEDIFF. And use -30 instead of 30.

Tara Kizer
SQL Server MVP since 2007
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Premature Yak Congratulator

22864 Posts

Posted - 08/18/2014 :  03:46:27  Show Profile  Send madhivanan a Yahoo! Message  Reply with Quote
Also it looks like MsgDate is of varchar datatype. You need to CAST it to a DATETIME datatype.

DELETE table WHERE cast(MsgDate as datetime) < Dateadd(day, -30, Getdate())


Failing to plan is Planning to fail
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