MySQL - Introduction to several ways to add indexes

1. Add PRIMARY KEY (primary key index )

mysql>ALTER TABLE `table_name` ADD PRIMARY KEY ( `column` )

2. Add UNIQUE (unique index)

mysql>ALTER TABLE `table_name` ADD UNIQUE ( `column` )

3. Add INDEX (normal index)

mysql>ALTER TABLE `table_name` ADD INDEX index_name ( `column` )

4. Add FULLTEXT (full-text index)

mysql>ALTER TABLE `table_name` ADD FULLTEXT ( `column`)

5. Add multi-column index

mysql>ALTER TABLE `table_name` ADD INDEX index_name ( `column1`, `column2`, `column3` )

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