Question

SQL Server专家的问题。在下面的查询中，我希望有一个额外的列，它也是SUMs Quantity，但是基于不同的Requirement Type。我尝试了一些想法 - CASE并在选择列表中添加子查询但所有返回的结果都太多了。我希望看到的是MATERIAL，MATERIAL_DESCRIPTION，SIZE_LITERAL，QUANTTITY，当需要类型='PB'时，数量的和，当需要类型='01'时不确定如何在两个不同的条件下添加数量两次。提前致谢

SELECT MATERIAL, 
       MATERIAL_DESCRIPTION, 
       SIZE_LITERAL, 
       SUM(QUANTITY) AS 'SUM_FCST' 

FROM   VW_MRP_ALLOCATION

WHERE REQUIREMENT_CATEGORY = 'A60381002'

AND MATERIAL_AVAILABILITY_DATE >= GETDATE()

AND REQUIREMENT_TYPE ='PB'


GROUP BY MATERIAL, 
         MATERIAL_DESCRIPTION,
         SIZE_LITERAL

ORDER BY MATERIAL, 
         SIZE_LITERAL

Answer 1

您可以在CASE内使用SUM()表达式。这是条件聚合：

SELECT MATERIAL, 
       MATERIAL_DESCRIPTION, 
       SIZE_LITERAL, 
       SUM(case when REQUIREMENT_TYPE ='PB' then QUANTITY else 0 end) AS 'SUM_FCST_PB',
       SUM(case when REQUIREMENT_TYPE ='01' then QUANTITY else 0 end) AS 'SUM_FCST_01'    
FROM   VW_MRP_ALLOCATION
WHERE REQUIREMENT_CATEGORY = 'A60381002'
  AND MATERIAL_AVAILABILITY_DATE >= GETDATE()
GROUP BY MATERIAL, 
         MATERIAL_DESCRIPTION,
         SIZE_LITERAL
ORDER BY MATERIAL, 
         SIZE_LITERAL

Answer 2

您可以在总和中使用案例如下：

SELECT MATERIAL, 
       MATERIAL_DESCRIPTION, 
       SIZE_LITERAL, 
       SUM(CASE WHEN [Requirement_Type] = 'PB' then QUANTITY else 0 end) AS 'SUM_FCST' 

FROM   VW_MRP_ALLOCATION

WHERE REQUIREMENT_CATEGORY = 'A60381002'

AND MATERIAL_AVAILABILITY_DATE >= GETDATE()

AND REQUIREMENT_TYPE ='PB'


GROUP BY MATERIAL, 
         MATERIAL_DESCRIPTION,
         SIZE_LITERAL

ORDER BY MATERIAL, 
         SIZE_LITERAL

查询中多次使用相同的列

2 个答案: