1、多表查询 1)笛卡尔集: select * from 表名1,表名2 select * from 表名1。表名2 where 表名1.字段名=表名2.字段名 注: 若有两张表 ...
SELECT FROM SELECT TT. ,ROWNUM RN FROM SELECT A.CASE ID AS TREATID, A.TYPE AS TYPE, B.CONTENT AS CONTENT, B.ADD USER ID AS ADDUSERID, B.Add User Type AS ADDUSERTRPE, A.CREATE TIME AS CREATETIME, B.CH ...
2016-10-08 11:06 1 1507 推荐指数:
1、多表查询 1)笛卡尔集: select * from 表名1,表名2 select * from 表名1。表名2 where 表名1.字段名=表名2.字段名 注: 若有两张表 ...
select file_id from ( select file_id , row_number() over (PARTITION BY prod_nane order by time desc) as row_number from 表名 where ...
select top 1 * from tablename order by 时间 desc ...
使用oracle中自带函数 wmsys.wm_concat(需合并列的字段名) 用法如下: select code,name,wmsys.wm_concat(baname) from tab group by code,name; ...
单表查询 前期表准备 create table emp( id int not null unique auto_increment, name varchar(20) not null, sex enum('male','female') not null default 'male ...
mysql数据库中,查询一个表的下一条数据减上一条数据的值的写法: ...
select diqu,fuzeren,stuff((select ','+yugong from ls where diqu = a.diqu and fuzeren ...