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2021-01-09 17:02:39 查看(245) 回复(0)
要求:
1.普通索引
create index index_user_name on user(name);
2.主键索引
alter table user add primary key(userid);
3.唯一索引
create unique index index_user_name on user(name);
4.多列索引
create unique index index_user_name on user(name,ename,city);
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