constraint for replacing primary key
If I have a table where primary key is composed by 4 attributes and I'm going to introduce the new attribute ID as primary key, which will replace the previous one. It's necessary to insert constraint for the 4 attributes? This constraint will avoid to insert records having the same values in 4 the attributes.
What do you think? It's necessary to insert the constraint?
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constraint for replacing primary key
January 22, 2020 09:50AM
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