Index usage in MySQL

One, create an index

  Use the alter table statement to create an index: applicable to database tables that have been created

ALTER TABLE 表名 ADD 索引类型 （unique,primary key,fulltext,index）[索引名]（字段名）

 

Two, delete the index

  Delete index

drop index 索引名 on 表名;

  Example: 

drop INDEX index_tax_vou_no ON tb_tax_calim2;

 

Three, view the index

  View index

show index from table_name;

示例：查看 "user" 表的索引
show index from user;