The CREATE INDEX command is utilized to create indexes within tables, permitting duplicate values.
Indexes expedite data retrieval from the database significantly. Although users cannot directly observe indexes, they effectively accelerate searches and queries.
The subsequent SQL statement generates an index named “idx_lastname” on the “LastName” column within the “Persons” table:
| CREATE INDEX idx_lastname ON Persons (LastName); |
To create an index on a combination of columns, you can specify the column names within parentheses, separated by commas.
| CREATE INDEX idx_pname ON Persons (LastName, FirstName); |
Note: Syntax for creating indexes may vary across different databases. Hence, it’s essential to verify the specific syntax for creating indexes in your database.
| Note: It’s crucial to verify the specific syntax for creating indexes in your database, as it may vary across different databases. |