Creating Indexes in SQL

 Creating Indexes in SQL

Indexes are used to improve the performance of SQL queries. We can create indexes on columns that are frequently used in WHERE, JOIN, or ORDER BY clauses. Here's an example:

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CREATE INDEX idx_employees_department ON employees (department);

In this example, we're creating an index on the "department" column of the "employees" table. This index will improve the performance of queries that filter or join on the "department" column.