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从MySQL表中删除索引

2024-04-26 19:27:10 348

要从MySQL表中删除索引，语法如下-

alter table yourTableName drop index `yourIndexName`;

让我们首先创建一个表-

Mysql> create table DemoTable1469
   -> (
   -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> StudentName varchar(40),
   -> StudentAge int
   -> );

以下是在列名上添加索引的查询-

mysql> create index `Student Name_Index` on DemoTable1469(StudentName);
Records: 0  Duplicates: 0  Warnings: 0

让我们检查表说明-

mysql> desc DemoTable1469;

这将产生以下输出-

+-------------+-------------+------+-----+---------+----------------+
| Field       |        Type | Null | Key | Default | Extra          |
+-------------+-------------+------+-----+---------+----------------+
| StudentId   |     int(11) | NO   | PRI | NULL | auto_increment    |
| StudentName | varchar(40) | YES  | MUL | NULL |                   |
| StudentAge  |     int(11) | YES  |     | NULL |                   |
+-------------+-------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)

以下是删除索引的查询-

mysql> alter table DemoTable1469 drop index `Student Name_Index`;
Records: 0  Duplicates: 0  Warnings: 0

让我们再次检查表描述-

mysql> desc DemoTable1469;

这将产生以下输出-

+-------------+-------------+------+-----+---------+----------------+
| Field       |        Type | Null | Key | Default | Extra          |
+-------------+-------------+------+-----+---------+----------------+
| StudentId   |     int(11) | NO   | PRI |    NULL | auto_increment |
| StudentName | varchar(40) | YES  |     | NULL    |                |
| StudentAge  |     int(11) | YES  |     |    NULL |                |
+-------------+-------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)

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从MySQL表中删除索引

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