Example of Nested select statement in SQL Server
The inner subquery (SELECT DepartmentID FROM Department WHERE DepartmentName = ‘Sales’) retrieves the DepartmentID for the ‘Sales’ department from the Department table. The outer query then selects the FirstName and LastName of employees whose DepartmentID matches the one obtained from the subquery, effectively fetching employees only from the Sales department.
Syntax:
SELECT columns
FROM table
WHERE column OPERATOR (SELECT columns FROM table WHERE condition);
Query:
SELECT FirstName, LastName
FROM Employee
WHERE DepartmentID = (SELECT DepartmentID FROM Department WHERE DepartmentName = 'Sales');
Output:
Explanation:
From the above Nested select query retrieves the FirstName and LastName of employees who work in the ‘Sales’ department, by filtering the Employee table based on the DepartmentID obtained from the Department table through the subquery.
What is Nested Select Statement in SQL Server
SQL Server is a powerful relational database management system. Sql Server is very good with its robustness and scalability. SQL Server operates as a client-server structure, imparting centralized management and scalability for huge-scale applications and enterprise-stage solutions. It offers advanced features which include excessive availability, protection, and extensive support for complex data operations.
In this article, we will go to cover the nested select statements in SQL Server, unraveling their functionality and demonstrating their versatility through complete examples and use cases.