The answer Is: Nested inner query. The initial query in the SQL statement is referred to as the Nested inner query in subquery jargon.
<h3>What are the fundamentals of subquery? </h3>
In addition to being known as an inner query or inner select, a subquery is also known as an outer query or outer select in the statement it is contained in.
Many statements in Transact-SQL that contain subqueries can also be written as joins. Only subqueries can be used to ask further inquiries.
A statement with a subquery and one without, which is semantically equal, typically have the same performance in Transact-SQL. See SQL statement processing for architectural details on how SQL Server handles queries.
However, a join performs better in some situations when existence must be verified. If duplicates are present, the nested query must be executed for each result of the outer query.
In such circumstances, a join strategy would produce subquery.
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