About Queries and Subqueries
A query is an operation that retrieves data from one or more tables or views. In this reference, a top-level SELECT statement is called a query, and a query nested within another SQL statement is called a subquery.
This section describes some types of queries and subqueries and how to use them. The top level of the syntax is shown in this chapter.
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SELECT for the full syntax of all the clauses and the semantics of this statement
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select::=
Text description of select
subquery::=
Text description of subquery
