Check constraint in SQL server multiple rows

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Dear All,
I Have a table as

and i want to add constraint that for each pid(e.g. pid=1 then sum of per should not be more than 100)
how can i add this constraint.
constraint should be violete for pid=2 because sum of per is (30+40+60) is more than 100.
How can i do this
Thanks in Advance

What I have tried:

i want to add constraint that for each pid(e.g. pid=1 then sum of per should not be more than 100)
how can i add this constraint.
constraint should be violete for pid=2  because sum of per is (30+40+60) is more than 100.
How can i do this
Thanks in Advance

Posted 25-Jul-17 19:24pm

SriNivas IT

Updated 25-Jul-17 20:44pm

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SriNivas IT 26-Jul-17 2:28am

Pls look into the matter,
i was so disappointed :(

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OriginalGriff · Accepted Answer · 2017-07-25T20:44:00

Don't. There is a CHECK constraint, but it can't do complicated stuff like sum existing records and compare against the value.

There are three ways to do this:
1) Do it in your presentation software before you try to INSERT or UPDATE a row.
2) Do it in a stored procedure, instead of attempting an INSERT or UPDATE directly.
3) Use a TRIGGER to detect when the value exceeded a limit.

I'd prefer 1, then 2, and would use 3 with reluctance.