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This week we are learning how to join tables (inner join, self join, outer join), about the set operations (union, intersect, minus), and sub-queries (correlated, non correlated) and their operators (in, any, some, all, exists). Same as last week, please choose one of these new aspects and describe its meaning and usage. Add to your description a simple example.
There are different types of Set operations, the one type I will discuss is (Union) is when two different request are combined into a single result. One could performed the sequence of operations
Sorry, no I do not need answer. Thanks