仅供参考 - 我真的不确定提出这个问题的标题。任何指导都是最受欢迎的。
下面我有一个“父母”地毯(A12345),最终切成2个或更多的地毯。这些地毯需要经过严格的洗涤,我需要知道地毯在“父母”和“儿童”地毯之间经过了多少次洗涤。
总而言之,“A12345-678”在切割之前有4次洗涤,然后在分离之后洗涤3次。
使用序列号,我必须能够将进程标记为第1,第2,第3等...使用Process_Num列是我想要在SQL中实现的所需列。
Rug_Num Sequence_Num Process Process_Num
A12345 10 Wash 1st Wash
A12345 11 Wash 2nd Wash
A12345 30 Wash 4th Wash
A12345 20 Wash 3rd Wash
'----Rug cut into 2 child rugs'
A12345-678 40 Wash 5th Wash
A12345-678 50 Wash 6th Wash
A12345-678 60 Wash 7th Wash
A12345-997 40 Wash 5th Wash
A12345-997 50 Wash 6th Wash
A12345-997 60 Wash 7th Wash
A12345-997 70 Wash 8th Wash
这是我的“进行中”声明,但我无法弄清楚如何在“THEN”之后添加一些东西,这会导致它将当前序列顺序编号为“1st,2nd,3rd”。我的想法是在第一个COUNT CASE WHEN
之后放另一个THEN
,但那将是一个无限的声明。
WITH toupdate AS (
SELECT m.*,
count(CASE WHEN (m.Process = 'Wash'
AND m.Rug_Num = m.Rug_Num
AND m.sequence_num < m.sequence_num)
THEN 1 ELSE 0 END)
OVER (PARTITION BY m.Process, m.Rug_Num, m.Process_Num) AS Process_Num_New
FROM mfng_data m
)
UPDATE toupdate
SET Process_Num = ISNULL(Process_Num_New,0);
所以上面我试图在SQL中复制COUNTIFS
(Excel)。 Excel示例如下。 H栏中的公式为:
=(COUNTIFS($C$3:$C$14,C3,$D$3:$D$14,"<"&D3,$E$3:$E$14,"Wash")+1)+IF(LEN(C3)>6,COUNTIFS($C$3:$C$14,$C$3,$E$3:$E$14,"Wash"),0)
我添加了+1,因此它将计算当前序列的数量,并为当前序列添加1。
你可以使用count(*)
与窗口功能over()
在下面的查询中有2个count()
。第一个计算父母的洗涤号,第二个count()
在孩子身上
select *,
Wash_No = count (case when Parent_Rug = Rug_Num then 1 end)
over (partition by Parent_Rug order by Sequence_num)
+ count (case when Parent_Rug <> Rug_Num then 1 end)
over (partition by Rug_Num order by Sequence_num)
from mfng_data
尝试使用以下方法
CREATE TABLE TestTable(
Rug_Num varchar(10),
Sequence_Num int,
Process varchar(10),
Process_Num int
)
INSERT TestTable(Rug_Num,Sequence_Num,Process)VALUES
('A12345', 10,'Wash')
,('A12345', 11,'Wash')
,('A12345', 30,'Wash')
,('A12345', 20,'Wash')
,('A12345-678',40,'Wash')
,('A12345-678',50,'Wash')
,('A12345-678',60,'Wash')
,('A12345-997',40,'Wash')
,('A12345-997',50,'Wash')
,('A12345-997',60,'Wash')
,('A12345-997',70,'Wash')
;WITH numCTE AS(
SELECT Sequence_Num,ROW_NUMBER()OVER(ORDER BY Sequence_Num) Process_Num
FROM
(
SELECT DISTINCT Sequence_Num
FROM TestTable
) q
)
UPDATE t
SET
t.Process_Num=n.Process_Num
FROM TestTable t
JOIN numCTE n ON t.Sequence_Num=n.Sequence_Num
SELECT *
FROM TestTable