"A SELECT statement nested inside another SELECT, INSERT, UPDATE, or DELETE statement, or inside another subquery." (Patrick Dalton, "Microsoft SQL Server Black Book", 1997)
"A SELECT statement that is usually a part of a larger SQL statement; a query nested inside a SELECT, INSERT, UPDATE, or DELETE statement." (Owen Williams, "MCSE TestPrep: SQL Server 6.5 Design and Implementation", 1998)
"A SELECT within another SQL statement, usually within another SELECT." (Peter Gulutzan & Trudy Pelzer, "SQL Performance Tuning", 2002)
"A query that is embedded in a main, or parent, query and used to assist in filtering the result set from a query." (Bob Bryla, "Oracle Database Foundations", 2004)
"A nested query that returns information to an outer query, thereby helping the outer query correctly identify results." (Robert D. Schneider and Darril Gibson, "Microsoft SQL Server 2008 All-In-One Desk Reference For Dummies", 2008)
"A complete SELECT statement that is part of another SELECT." (Jan L Harrington, "SQL Clearly Explained 3rd Ed. ", 2010)
"A SELECT statement that contains one or more subqueries." (SQL Server 2012 Glossary, "Microsoft", 2012)
"A query nested within another SQL statement. Unlike implicit queries, subqueries use a SELECT statement to retrieve data." (Oracle, "Database SQL Tuning Guide Glossary", 2013)
"A form of a full-select that is enclosed within parentheses and used as a component of a query." (Sybase, "Open Server Server-Library/C Reference Manual", 2019)
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