根据符合条件的 1 条记录更新多条记录

Update multiple records based on 1 record meeting a criteria

我正在尝试 Select 数据集中的所有记录,其中 1 条记录符合条件。我有一个 table 数据,其中包含一个人每天的工作时间。如果该周内的一条记录的 'logged' 标志设置为 'N',我需要 select 一个人那一周的所有记录。这是一个数据示例:

t_hours:

Name  Week  Weekday  Hours  Logged
===============================
Jim   1     Mon      8       Y
Jim   1     Wed      8       Y
Jim   1     Fri      8       Y
Jim   2     Mon      8       Y
Jim   2     Wed      8       Y
Bill  1     Mon      8       N
Bill  1     Tue      8       Y
Bill  1     Wed      8       Y
Bill  1     Thu      8       Y
Bill  2     Mon      8       Y
Bill  2     Tue      8       Y

我想编写一个查询,将一个人工作周的所有记录更新为 Logged='N',如果他们有一天 Logged='N'。但我不知道如何 select 记录。以下是我要更新的记录:

Name  Week  Weekday  Hours  Logged
===============================
Bill  1     Mon      8       N
Bill  1     Tue      8       Y
Bill  1     Wed      8       Y
Bill  1     Thu      8       Y

我试过正常的 select,但无法弄清楚如何在 where 子句中有两个相关的子查询:

SELECT * FROM t_hours
WHERE (Name = (SELECT t1.Name FROM t_hours t1 
               where t1.Name = t2.Name and t1.Week = t2.Week and 
               t1.Logged = 'N') and
       Week = (SELECT t2.Week FROM t_hours t2 
               where t1.Name = t2.Name and t1.Week = t2.Week and 
               t2.Logged = 'N')

但这不起作用,非常感谢任何帮助。

像下面这样尝试 - 使用 exists

select t1.* from table_name t1
where exists( select 1 from table_name t2 where t1.week=t2.week
                                          and t2.logged='N' and t1.name=t2.name
             )

这是你想要的吗?

   Update table set Logged='N' where
      Exists (Select 1 from(Select 
        Name,Workweek group by Name, 
       Workweek having count(Logged='N')
        >=1)t1 where Name=t1.name and  
         Workweek=t1.Workweek) 

Return数据:

 SELECT *
FROM   t_hours t1
WHERE  EXISTS (SELECT 1
               FROM   t_hours t2
               WHERE  t1.NAME = t2.NAME
                      AND t1.week = t2.week
                      AND t2.logged = 'N');  

更新数据:

 UPDATE t_hours
SET    logged = 'N'
WHERE  EXISTS (SELECT 1
               FROM   t_hours t2
               WHERE  t1.NAME = t2.NAME
                      AND t1.week = t2.week
                      AND t2.logged = 'N');  

如果数据集足够大,您可以按名称、周和记录类型分组。

您可以使用可更新的 CTE:

with toupdate as (
      select t.*,
             min(logged) over (partition by name, week) as min_logged
      from t
     )
update toupdate
    set logged = min_logged
    where min_logged = 'N' and min_logged <> logged;

如果任何 logged 值是 'N'min(logged) 表达式将 return 'N'(如果有的话,其余的是 'Y') 对于 person/week.