T-SQLは、追加と削除によるアイテム数をカウントします。

Question

SQL Server 2008ではTable1を使用していますが、期待どおりの出力結果を得たいと考えています。 アクション 'カウント'が発生するたびに、関連するすべてのアイテムを追加/削除し、合計を表示します。 すべての項目が0カウントで始まると仮定します。

感謝します。生成された結果は、あなたには、いくつかの計算ミスをしたので、あなたはおそらく示したものと異なっているが 以下のように

CREATE TABLE Table1([Time] [smalldatetime] NULL,[Action] [nvarchar](10) NULL,[Item] [nchar](50) NULL) 
insert into Table1 values('2009-08-22 20:34:02','Count','Apple') 
insert into Table1 values('2009-08-22 20:34:03','Count','Banana') 
insert into Table1 values('2009-08-22 20:34:04','Count','Mango') 
insert into Table1 values('2009-08-22 20:34:05','Count','Black Berry') 
insert into Table1 values('2009-08-22 20:34:06','Count','Orange') 
insert into Table1 values('2009-08-22 20:34:07','Add','Apple') 
insert into Table1 values('2009-08-22 20:34:08','Add','Banana') 
insert into Table1 values('2009-08-22 20:34:09','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:10','Remove','Banana') 
insert into Table1 values('2009-08-22 20:34:11','Add','Banana') 
insert into Table1 values('2009-08-22 20:34:12','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:13','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:14','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:15','Remove','Mango') 
insert into Table1 values('2009-08-22 20:34:17','Count','Apple') 
insert into Table1 values('2009-08-22 20:34:18','Add','Banana') 
insert into Table1 values('2009-08-22 20:34:19','Add','Banana') 
insert into Table1 values('2009-08-22 20:34:20','Remove','Banana') 
insert into Table1 values('2009-08-22 20:34:21','Add','Apple') 
insert into Table1 values('2009-08-22 20:34:22','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:23','Add','Apple') 
insert into Table1 values('2009-08-22 20:34:24','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:25','Remove','Apple') 
insert into Table1 values('2009-08-22 20:34:26','Count','Mango') 
insert into Table1 values('2009-08-22 20:34:27','Add','Apple') 
insert into Table1 values('2009-08-22 20:34:28','Add','Banana') 
insert into Table1 values('2009-08-22 20:34:29','Remove','Apple') 
insert into Table1 values('2009-08-22 20:34:30','Remove','Banana') 
insert into Table1 values('2009-08-22 20:34:31','Add','Banana') 
insert into Table1 values('2009-08-22 20:34:32','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:33','Count','Banana') 
insert into Table1 values('2009-08-22 20:34:34','Add','Banana') 
insert into Table1 values('2009-08-22 20:34:35','Add','Apple') 
insert into Table1 values('2009-08-22 20:34:36','Remove','Mango') 
insert into Table1 values('2009-08-22 20:34:37','Add','Apple') 
insert into Table1 values('2009-08-22 20:34:38','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:39','Count','Apple') 
insert into Table1 values('2009-08-22 20:34:40','Remove','Apple') 
insert into Table1 values('2009-08-22 20:34:41','Remove','Banana') 
insert into Table1 values('2009-08-22 20:34:42','Add','Banana') 
insert into Table1 values('2009-08-22 20:34:43','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:44','Count','Banana') 
insert into Table1 values('2009-08-22 20:34:45','Remove','Banana') 
insert into Table1 values('2009-08-22 20:34:46','Remove','Apple') 
insert into Table1 values('2009-08-22 20:34:47','Remove','Mango') 
insert into Table1 values('2009-08-22 20:34:48','Add','Apple') 
insert into Table1 values('2009-08-22 20:34:49','Add','Mango') 
insert into Table1 values('2009-08-22 20:34:50','Count','Mango') 

Answer 1

これは左アウターセルフで達成することができるが参加します。とにかく、同様のアプローチを試してください。

select a.time,a.item, 
SUM(case 
when b.action='Add' then 1 
when b.action='Remove' then -1 
else 0 end) 
from table1 as a 
left join table1 as b 
on a.item=b.item 
and b.time<a.time 
where a.action='Count' 
group by a.time,a.item,a.action 
order by 1