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  • How to create INDEXES in tables in MySQL?

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    We create INDEX in a table to find data data fast and efficiently. It allows the database to find data without reading all the records of the table. When we apply search and queries to table INDEX are used to make them fast.

    To create indexes in tables we use CREATE INDEX statement.

    You should only create indexes on columns that you frequently use for searching purpose, because updating a table with indexes takes more time than updating a table without indexes.

    CREATE INDEX Syntax

    Creates an index on a table. Duplicate values in columns are allowed:

    CREATE INDEX index_name
    ON table_name (column_name);
    

    CREATE UNIQUE INDEX Syntax

    Creates a unique index on a table. Duplicate values in columns are not allowed:

    CREATE UNIQUE INDEX index_name
    ON table_name (column_name);
    

    CREATE INDEX Example

    The statement below creates an index named "person_user_name_idx" on the "user_name" column in the "user" table:

    CREATE INDEX person_user_name_idx
    ON user (user_name);
    

    We can create index on a combination of columns, for we just need to pass column names as below:

    CREATE INDEX user_index
    ON user (user_name, user_email);
    

    Hope this will help you :)

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