This article mainly shares with you the methods of creating and deleting indexes in MySQL. I hope it can help you.
1. Add index
(1)ALTER TABLE statement
1.PRIMARY KEY（主键索引） mysql>ALTER TABLE `table_name` ADD PRIMARY KEY ( `column` ) 2.UNIQUE(唯一索引) mysql>ALTER TABLE `table_name` ADD UNIQUE (`column` ) 3.INDEX(普通索引) mysql>ALTER TABLE `table_name` ADD INDEX index_name ( `column` ) 4.FULLTEXT(全文索引) mysql>ALTER TABLE `table_name` ADD FULLTEXT ( `column` ) 5.多列索引 mysql>ALTER TABLE `table_name` ADD INDEX index_name ( `column1`, `column2`, `column3` )
(2)CREATE INDEX statement
1.UNIQUE(唯一索引) mysql>CREATE UNIQUE INDEX index_name ON `table_name` (`column` ) 2.INDEX(普通索引) mysql>CREATE INDEX index_name ON `table_name` ( `column` ) 3.多列索引 mysql>CREATE INDEX index_name ON `table_name` ( `column1`, `column2`, `column3` )
2. Delete index
1.PRIMARY KEY（主键索引） mysql>ALTER TABLE `table_name` DROP PRIMARY KEY 3.INDEX(普通索引)或UNIQUE(唯一索引) mysql>ALTER TABLE `table_name` DROP INDEX index_name mysql>DROP INDEX index_name ON `talbe_name`
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