1、多表查詢 1)笛卡爾集: 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: 若有兩張表 ...
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 ...
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1、多表查詢 1)笛卡爾集: 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: 若有兩張表 ...
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 時間 desc ...
使用oracle中自帶函數 wmsys.wm_concat(需合並列的字段名) 用法如下: select code,name,wmsys.wm_concat(baname) from tab group by code,name; ...
單表查詢 前期表准備 create table emp( id int not null unique auto_increment, name varchar(20) not null, sex enum('male','female') not null default 'male ...
mysql數據庫中,查詢一個表的下一條數據減上一條數據的值的寫法: ...
select diqu,fuzeren,stuff((select ','+yugong from ls where diqu = a.diqu and fuzeren ...