Can anyone help me in finding whay the below code is not working. It says "invalid character"
It is a trigger on table teacher that restricts...
Thanks for the reply.
(1) Below is the extract from wikipedia:
Now, if employeeID is a candidate key then why not it is the superkey....
can anyone explain me what is the difference between superkey and candidate key.
I have read the definition but could'nt understand.
Can anybody plz help me in finding out the difference between two concepts:
serializibility and conflict serializibility....
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