mysql数据经常使用知识点

  //设置表自增初始值

alter table users AUTO_INCREMENT=10000;

//mysql经过关联字段同步两张表的字段内容

update table_name1 a
set a.content = (select b.content from table_name2 b where a.key= b.key)
where exists (select 1 from table_name2 c where a.key= c.key);