SubQueries in SQL
In the realm of database management, SQL (Structured Query Language) subqueries stand as powerful tools for retrieving data from multiple tables or deriving insights from complex datasets. Subqueries, also known as nested queries or inner queries, allow developers to embed one query within another, enabling dynamic and flexible data retrieval. In this blog post, we'll explore the concept of SQL subqueries, their types, syntax, and practical applications. A subquery is a SELECT statement nested within another SQL statement, such as SELECT, INSERT, UPDATE, or DELETE. Subqueries can be used in various contexts, including WHERE clauses, FROM clauses, HAVING clauses, and even within other subqueries. They allow developers to break down complex problems into smaller, more manageable parts and execute queries dynamically based on the results of inner queries. Types of SQL Subqueries Single-Row Subqueries: Single-row subqueries return only one row of results and are typically used in sce...