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 Making a trigger check result		  New Topic  Reply to Topic
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skelle
Starting Member

1 Posts
Posted - 05/30/2012 :  14:54:01  Show Profile  Reply with Quote
Hello,

I want to make a trigger to check a result. That result may not be higher or equal to 20. When it is higher than 20, it has to be replaced by 20.

Someone out there who can help me?

robvolk
Most Valuable Yak

USA
15559 Posts
Posted - 05/30/2012 :  15:07:42  Show Profile  Visit robvolk's Homepage  Reply with Quote
It's better to have a CHECK constraint on the table that prevents values higher than 20 from being inserted or updated. Is this data being imported from a different source, or being entered by hand? If it's being imported then you should have an ETL process that changes higher values to 20, rather than having a trigger do it.

While a trigger can certainly do this, you could encounter performance issues, and it can't guarantee the data will be correct.
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madhivanan
Premature Yak Congratulator

India
22461 Posts
Posted - 06/04/2012 :  09:30:15  Show Profile  Send madhivanan a Yahoo! Message  Reply with Quote
Do you have data already in the table? You can just use a SELECT statement

select case when col>20 then 20 else col end as col from table

If you want to restrict the values while adding to table, better option is as suggested, to implement a check constraint

Madhivanan

Failing to plan is Planning to fail
Edited by - madhivanan on 06/04/2012 09:31:55
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