单键索引: create unique index UNIQUE_PERSON_NICK_NAME_INDEX ON Person (NickName)create unique index UNIQUE_PERSON_NICK_NAME_INDEX ON Person (NickName) 双键索引: create unique index UNIQUE_PERSON_FULL_NAME_INDEX ON Person (LastName, FirstName)双键索引:
create unique index UNIQUE_PERSON_FULL_NAME_INDEX ON Person (LastName, FirstName)
创建唯一索引
单键索引:
create unique index UNIQUE_PERSON_NICK_NAME_INDEX ON Person (NickName)
create unique index UNIQUE_PERSON_NICK_NAME_INDEX ON Person (NickName)
双键索引:
create unique index UNIQUE_PERSON_FULL_NAME_INDEX ON Person (LastName, FirstName)
双键索引:create unique index UNIQUE_PERSON_FULL_NAME_INDEX ON Person (LastName, FirstName)
MYSQL完整创建索引语法:
你说的重复是一个字段重复还是所有字段重复呢
MySQL中的insert ignore into, replace into等的一些用法总结