该文转载自:http://www.cnblogs.com/mytechblog/articles/2105785.html sql中exists,not exists的用法 exists : 强调的是是否返回结果集,不要求知道返回什么, 比如: select name from student where sex = 'm' and mark exists(select 1 from grade where ...) ,只要exists引导的子句有结果集返回,那么exists这个条件就算成立了
Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. +----+------------------+ | Id | Email | +----+------------------+ | 1 | john@example.com | | 2 | bob@example.com |