Sql Subset

How to use Sql subset. Understand one more use of sql join and sql subquery

What is Subset?

It's better to explain subset with a picture.
Table A is said to be the subset of table B

The relationship is called inclusion or containment.


Usually the problem is as followed:
I have two tables, A and B. Is there any entry in A that is not in B?

That is, in other words, is A the subset of B?

There are two ways to solve this. One is using Sql subquery. Two is using Sql Join.

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