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Subqueries and correlated queries

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Describe the different types of subqueries and correlated queries. Provide at least two examples.

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Subqueries and correlated queries are described.

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Primarily there are two types of subqueries 1) single-row and 2)multiple-row subqueries.
The single-row subquery returns only one row for the given query. There is a scenario in single row subquery, where the query returns with one column. This type of query is called a scalar subquery. This type of query is useful when you are processing using a constant or an expreseesion or a ...

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