How Do I Set A Contraints For Set Of Rows In Table

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now i am creating a accounting software using oracle
in that one of the major table is daybook from that i created all reports etc..

structure is like this

id slno acc_id amount

1 st trans

1 1 1 500
1 2 27 -500

second trans
2 1 15 700
2 2 14 - 100
2 3 28 -400
2 4 90 -200

i have to check is the transaction sum is zero

is it possible to set any constraint or any other way in oracle

Posted 18-Feb-15 18:50pm

Mahesh K.M

Updated 18-Feb-15 18:52pm

v2

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Wendelius · Answer 1 · 2015-02-18T18:58:00

You can't create such constraint and in this case you can't use triggers since examining the same table that has been modified would cause a ORA-04091.

One possibility is to use a stored procedure which would contain the check and if the sum is anything other than zero an error would be raised. All modifications should then go through this procedure.