SQL Index Creation Methods Explained

1 year ago
Emily Johnson
1 minute

In SQL, you can create indexes in several ways:

  1. Specify indexes when creating tables: In the SQL statement for creating tables, you can create indexes by adding the “INDEX” or “UNIQUE” keyword after the field declaration.

“Like a breath of fresh air”

CREATE TABLE table_name (
    column1 INT,
    column2 VARCHAR(50),
    INDEX index_name (column1),
    UNIQUE INDEX unique_index_name (column2)
);
  1. You can add an index to an existing table using the ALTER TABLE statement.

For example:

ALTER TABLE table_name
ADD INDEX index_name (column1);
  1. You can create an index using the CREATE INDEX statement.

For example:

CREATE INDEX index_name
ON table_name (column1);
  1. You can create a unique index using the CREATE UNIQUE INDEX statement.

For example,

CREATE UNIQUE INDEX unique_index_name
ON table_name (column2);
  1. You can create a full-text index using the CREATE FULLTEXT INDEX statement.

For example:

CREATE FULLTEXT INDEX fulltext_index_name
ON table_name (column2);

The method of creating an index should be chosen according to specific needs.

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