Join == inner join, it selects records that have matching value in both tables. Outer join equals to full join: it returns all the records when there is match in left and right t...
代码:using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data;using System.Reflection;namespace TestConsole{ public class Program { public stat...
join sb.加入到某一些人中,eg. Do you like to join us?
join +organization= become a nember in the organization 成为某个组织的一院。
join in=take part in+activities参加某个活动
attend+meeting参加会议...
DROP TABLE TEST1 PURGE;DORP TABLE TEST2 PURGE;-- 左表CREATE TABLE LEFT_TAB ASSELECT 'left_1' as name, '1' AS id FROM dual UNION ALLSELECT 'left_2' as name, '2' AS id FROM dual UNION ALLSELECT 'left_3'...