(1)Left join 更新update a set a.name=b.name from a left join b on a.id=b.stuid(2)ROW_NUMBERselect ROW_NUMBER() over(partition by name order by score) as rows,id,score, id from student partition by关键字是分析性函数的一部分,它和聚合函数(如group by)不同的地方在于它能返回一个分组中的多条记录,而聚…
full join 横向join ,不能map join 走shuffle row_number() over ( partition by 主键 order by $flag desc) rank ... where rank =1 ,走shufle select id, order_datekey, f_procurement_order, from ( select id, order_datekey, f_procurement_order, row_number() over ( pa…
做查询的时候,发现一个问题,连接之后,有一个表里面有重复的数据.导致另一个表的记录,跟着重复了几遍.用户曾经反馈,评论会多出来几条, 一直没找到原因.只到发现这个问题.才发现了原因.因为一直用sql server2000,所以就没有积极主动的学习.经过老大的提醒,才发现新的语法 ROW_NUMBER() OVER (PARTITION BY M ORDER BY N DESC 能解决问题,记录备查 SELECT dbo.t_commentmaster.* t1.nickname AS open…
当我用这个进行更改值时,type未控制order表 其他数据被更改 还好备份数据表了(这里就体现了备份的重要性) UPDATE expense_order as a left join ( SELECT detail.company_id,detail.`order_id`,sum(detail.`deduction_money`) as amount FROM expense_amortize_detail as detail JOIN `pigcms_expense_order` as ex…
update SO_Master set LotteryNo=t2.LotteryNo,UpdateTime=GETDATE() --select sm.LotteryNo,sm.SysNo,t2.LotteryNo from SO_Master sm inner join ( select SysNo,ROW_NUMBER() over(order by sysno asc) rIndex from SO_Master where WebSiteSysNo =6 and SOAmt >=800…
--从10001起,借用生成的行号,批量编号表记录 ; update t1 set t1.newNo=t2.newNo from student t1 join (select id, (row_number() over(order by id) + @start) newNo from student) t2 on t1.id=t2.id…