How Can I Prevent From Inserting Duplicate Data?
I have a table storing only 2 FKs, let's say PID, MID
Is there any way that I can check distinct data before row is added to this table?
For example, current data is
PID MID
------------
100 2001
100 2005
101 3002
102 1009
102 7523
102 2449
If my query is about to insert PID 100, MID 2001, since it's existing data, i don't want to add it. Can I use trigger to solve this issue?
Thanks.
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