If a subquery is used in the FROM clause of a query, how are the subquery’s results referenced in other clauses of the query?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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If a subquery is used in the FROM clause of a query, how are the subquery’s results referenced in other clauses of the query?

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Results of a sub query used in FROM clause

  • The FROM clause is used to list tables and any joins required for the SQL statement.
  • When sub queries are used in FROM clause, then they act as a table used for selecting columns and then joins to other tables.
  • It can be used to specify a sub query expression in SQL.
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