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)
MYSQL5.7 CREATE INDEX Syntax🎜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