select *from (select emp.*,row_number() over(partition by deptno order by rownum) cn from emp)where ...
select from table where id in select max id from table group by sku 說明:id是自增序列,sku是表中的一個字段 ...
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select *from (select emp.*,row_number() over(partition by deptno order by rownum) cn from emp)where ...
select t1.* from coal_installed_capacity t1where NOT EXISTS (select * from coal_installed_capacit ...
select * from 表名 limit 1; ...
select * FROM SU_supplycontract t WHERE supplyContractCode="CRM20 ...
GROUP BY 分組中的坑 1.分組后select后的字段只能有以下兩種: 出現在group by 后面的字段 使用聚合函數的列 2.group by 默認取非聚合的第一條記錄 例題:牛客網數據庫實戰之獲取所有部門中當前員工薪水最高的相關信息 表:dept_emp ...
SELECT * FROM( SELECT [SPID] ,[PH1] ...
1、hive的分組和組內排序---語法 語法: row_number() over (partition by 字段a order by 計算項b desc ) rank ...
查詢中經常遇到這種查詢,分組后取每組第一條。分享下一個SQL語句: 注:我使用MS SQL 08 R2 ...