This tutorial shows you how to use the Oracle subquery to construct more readable queries without using complex joins or unions.

SQL Language Reference Using Subqueries A subquery answers multiple-part questions. For example, to determine who works in Taylor's department, you can first use a subquery to …

Dec 13, 2013 · When you use a subquery in a select clause, Oracle essentially treats it as a left join (you can see this in the explain plan for your query), with the cardinality of the rows being …

Sep 11, 2025 · What are the Different types of Subqueries in Oracle? A subquery is a SELECT statement that is included inside another SQL statement. It is sometimes referred to as an …

Sep 8, 2025 · These examples showcase how subqueries can be used for various operations like selecting, updating, deleting or inserting data, providing insights into their syntax and …

The WITH clause, or subquery factoring clause, is part of the SQL-99 standard and was added into the Oracle SQL syntax in Oracle 9.2. The WITH clause may be processed as an inline …

Using a Subquery is a much easier and powerful way of retrieving information from tables and to reduce the number of steps it takes to get the final result. In this tutorial we will learn about the …

In this article, I am going to discuss Subqueries in Oracle with Examples. At the end of this article, you will understand what are subqueries, why we need subqueries, and how to use …

This chapter describes SQL queries and subqueries. This chapter contains these sections:

Jul 23, 2025 · PL/SQL subqueries are powerful SQL features that allow for the nesting of one query inside another for dynamic data retrieval. They have extensive applications when …