How to add index in SQL Server
By FoxLearn 7/2/2024 3:54:21 AM 221
Here’s how to add index in SQL Server.
Syntax
CREATE INDEX index_name ON table_name (column1, column2, ...)
For example:
Let's say you have a table named Employees
and you frequently search by the FirstName
column.
CREATE INDEX idx_FirstName ON Employees (FirstName)
Explanation:
CREATE INDEX: This statement is used to create a new index on a table.
index_name: This name must be unique within the database.
ON table_name: The name of the table on which you want to create the index.
(column1, column2, ...): You can create an index on a single column or multiple columns. The order of columns in the index definition can impact the index's effectiveness, especially if you have queries that filter or sort by multiple columns.
If you need to remove an index, you can use the DROP INDEX
statement.
DROP INDEX index_name ON table_name
Adding indexes can be a powerful tool to optimize query performance in SQL Server
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