如何在组中查找重复项-SQL 2008
我有一个包含以下数据的表(MyTable)。(按订单号、类别、类型排序) 我需要做的是,浏览表格,看看是否有任何“类别”有多个“主要单元”。 如果是,则对整个类别发出警告。预期结果应该是这样的如何在组中查找重复项-SQL 2008,sql,database,sql-server-2008,Sql,Database,Sql Server 2008,我有一个包含以下数据的表(MyTable)。(按订单号、类别、类型排序) 我需要做的是,浏览表格,看看是否有任何“类别”有多个“主要单元”。 如果是,则对整个类别发出警告。预期结果应该是这样的 Order _No Category Type Warning Ord1 A Main Unit Ord1 A Other Ord1 A Other Ord2 B Main Unit More than one Main
Order _No Category Type Warning
Ord1 A Main Unit
Ord1 A Other
Ord1 A Other
Ord2 B Main Unit More than one Main Units
Ord2 B Main Unit More than one Main Units
Ord2 B Other More than one Main Units
我尝试了几种方法(使用子查询)来获得结果,但没有成功。请帮忙
(Case
When (Select t1.Category
From MyTable as t1
Where MyTable.Order_No = t1.Order_No
AND MyTable.Category = t1. Category
AND MyTable.Type = t1.Type
AND MyTable.Type = ‘Main Unit’
Group by t1. t1.Order_No, t1. Category, t1.Type
Having Count(*) >1) = 1
Then ‘More than one Main Units’
Else ‘’ End ) as Warning
一个选项是使用
COUNT()OVER()
对主要单元进行计数,按类别进行划分
SELECT Order_No, Category, Type,
CASE WHEN COUNT(CASE WHEN Type='Main Unit' THEN 1 ELSE NULL END)
OVER (PARTITION BY Category) > 1
THEN 'More than one Main Units' ELSE '' END Warning
FROM MyTable
.是否需要列出所有记录 如果您只需要副本,可以执行以下操作:
select Order_No, Category, Type, count(*) as dupes
from MyTable
where Type='Main Unit'
group by Order_No, Category, Type
having count(*)>1
order by count(*) DESC;
另一种方法是使用CTE。这是我的建议
另一个选项是使用
存在
select [Order], _No, Category, Type,
(case when exists (
select 1 from mytable t2
Where category = 'main unit'
and t2.[Order] = t.[Order] and t2._No = t._No
group by [Order]
having Count(*) > 1)
then 'More than one Main Units'
else '' end) as Warning
From MyTable t
它对约阿希姆有效。非常感谢你让我开心。祝你2014年快乐!!我试过了,这也行!谢谢。多亏了像你这样的人,我每天都能学到一些东西1.我选了第一个。。但是谢谢你的帮助我第一次去。。但是谢谢你的帮助
;with categoriesWithMoreThanOneType as
(
select category, order_type
from
mytable
where
order_type = 'Main Unit'
group by category, order_type
having count(1) > 1
)
select
m.*,
case
when c.order_type is null then ''
else
'More than one ' + c.order_type
end as Warning
from
mytable m
left outer join categoriesWithMoreThanOneType c on
m.category = c.category
select [Order], _No, Category, Type,
(case when exists (
select 1 from mytable t2
Where category = 'main unit'
and t2.[Order] = t.[Order] and t2._No = t._No
group by [Order]
having Count(*) > 1)
then 'More than one Main Units'
else '' end) as Warning
From MyTable t