What is an Index in an SQL Server Database?

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Ashutosh Kumar Verma · Answer

SQL Server Index
An index in a SQL database is a data structure that improves the speed of data retrieval in a database table at the expense of additional space and reduced performance in write operations
Example-
Suppose you have a table Employee with the columns emp_id,
name, age, and department_id. If you frequently search for employees based on their
emp_id, creating an index on the emp_id column can greatly speed up those search operas
This SQL statement creates an index named idemployee_id in the 
emp_id column of the Employee table.and 
CREATE INDEX idemployee_id ON Employees(emp_id);
The database engine can use the idemployee_id index to quickly find rows where
emp_id is equal to 1001, rather than scanning the entire
Employees table sequentially.
SELECT * FROM employees WHERE employee_id = 1001;
and 
Also, Read: 
What are SQL Stored Procedures in the Database?

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What is an Index in an SQL Server Database?

Ashutosh Kumar Verma

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SQL Server Index

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