合并具有相同值的行成单排

Question

我写了下面的查询：

select distinct 
t0.DocDate 
,t4.U_SES_VS as 'Value stream' 

,case when (t1.ItemCode) = 'WC-QA' then count(t1.itemcode) else 0 end as 'WC-QA' 
,case when (t1.ItemCode) = 'WC-REC_INSPECTION' then count(t1.itemcode) else 0 end as 'Inspection' 


from ige1 t1 
INNER JOIN OIGE T0 ON T1.DOCENTRY = T0.DOCENTRY 
and few other tables T2,T3,T4,T5 all on Inner Join 

Where t1.qty > = t3.qty 

group by t0.docdate,t4.u_ses_vs,t1.itemcode 

我有以下的输出：

**DocDate** | **Value Stream** | **WC-QA** | **Inspection** | 
2017-04-14 | Engineering  |  0 |  0   | 
2017-04-14 | Production  |  14 |  0   | 
2017-04-14 | Quality   |  5 |  0   | 
2017-04-14 | Quality   |  0 |  1   | 

我要合并的质量行是在以下格式：

2017-04-14 | Quality |  5  | 1  | 

我该怎么做？

Answer 1

我想这是你想要的东西：

select t0.DocDate 
     sum(case when t1.ItemCode = 'WC-QA' then 1 else 0 end) as WC_QA, 
     sum(case when t1.ItemCode = 'WC-REC_INSPECTION' then 1 else 0 end) as Inspection 
from ige1 t1 INNER JOIN 
    OIGE T0 
    ON T1.DOCENTRY = T0.DOCENTRY 
    and few other tables T2,T3,T4,T5 all on Inner Join 
Where t1.qty > = t3.qty 
group by t0.docdate; 

我称之为 “有条件的聚集”;即当case进入聚合函数内时。

注：

• select distinct几乎与group by从来没有合适的。这通常表明一个问题。
• group by没有聚合功能通常表示有问题。
• 使用group by可以在结果集中定义所需的每个唯一行。在这种情况下，您似乎每个日期都需要一行。
• 只对字符串和日期常量使用单引号;不要将它们用于列别名。

Answer 2

从分组和使用SUM取值：

select 
t0.DocDate 
,t4.U_SES_VS as 'Value stream' 
,SUM(case when (t1.ItemCode) = 'WC-QA' then count(t1.itemcode) else 0 end) as 'WC-QA' 
,sum(case when (t1.ItemCode) = 'WC-REC_INSPECTION' then count(t1.itemcode) else 0 end) as 'Inspection' 
from ige1 t1 
INNER JOIN OIGE T0 ON T1.DOCENTRY = T0.DOCENTRY 
and few other tables T2,T3,T4,T5 all on Inner Join 
Where t1.qty > = t3.qty 
group by t0.docdate,t4.u_ses_vs 

Answer 3

你可以改变Count到SUM和group by删除t1.itemcode。 删除distinct，因为你有group by

select 
t0.DocDate 
,t4.U_SES_VS as 'Value stream' 
,SUM(case when (t1.ItemCode) = 'WC-QA' then 1 else 0 end) as 'WC-QA' 
,SUM(case when (t1.ItemCode) = 'WC-REC_INSPECTION' then 1 else 0 end) as 'Inspection' 

from ige1 t1 
INNER JOIN OIGE T0 ON T1.DOCENTRY = T0.DOCENTRY 
and few other tables T2,T3,T4,T5 all on Inner Join 
Where t1.qty > = t3.qty 
group by t0.docdate,t4.u_ses_vs