Question

我有两张桌子。第一个包含库存清单（物料），第二个包含销售历史（invoiceLines）。

+--------------------+  +--------------------+
|        items       +  +    invoiceLines    +
+--------------------+  +--------------------+
+ id                 +  + itemCode           +
+ itemDesc           +  + qtyShipped         +
+ qtyOnHandW1        +  + invDate            +
+--------------------+  +--------------------+

我可以使用单独的查询获取我想要的数据，例如：

SELECT itemCode, itemDesc, ROUND(SUM(qtyShipped)) as m11
FROM invoiceLines
WHERE invDate >= (NOW() - INTERVAL 11 MONTH) AND invDate <= (NOW() - INTERVAL 10 MONTH)
AND itemCode = 001
GROUP BY itemCode;

但是，我想从项目中返回id，itemDesc，qtyOnHandW1，与去年（m12）本月的SUM或qtyShipped一样，本月+去年（m11）+ 1m，本月+去年（m10）+ 2m。

+-------------------------------------------------------------------+
|    id    |     itemDesc      |   qtyOH  |  m12   |  m11  |  m10   |
+-------------------------------------------------------------------+
+ 001      | product A         |    50    |   32   |   25  |   70   |
+-------------------------------------------------------------------+
+ 002      | product B         |    31    |   16   |   31  |   41   |
+-------------------------------------------------------------------+
+ 003      | product C         |    5     |   22   |   11  |    3   |
+-------------------------------------------------------------------+

谢谢！

Answer 1

尝试将您的查询更改为类似的内容...假设您正在寻找2017年引用的月份....

SELECT 
 a.itemCode as itemCode, 
 a.itemDesc as itemCode, 
 (select ROUND(SUM(qtyShipped)) 
  from invoiceLines 
  where date_format(invDate,'%Y%m') = '201712' and itemCode = a.itemCode 
  group by date_format(invDate,'%Y%m'),itemCode ) as m12,
 (select ROUND(SUM(qtyShipped)) 
  from invoiceLines 
  where date_format(invDate,'%Y%m') = '201711' and itemCode = a.itemCode
  group by date_format(invDate,'%Y%m'),itemCode ) as m11,
 (select ROUND(SUM(qtyShipped)) 
  from invoiceLines 
  where date_format(invDate,'%Y%m') = '201710' and itemCode = a.itemCode
  group by date_format(invDate,'%Y%m'),itemCode ) as m10 
FROM invoiceLines as a
AND a.itemCode = 001
GROUP BY a.itemCode;

Answer 2

如果无法访问某些示例数据，则很难回复，但此查询应该有效：

SELECT i.id, i.itemDesc, i.qtyOnHandW1, 
   SUM(CASE WHEN l.invDate BETWEEN (NOW() - INTERVAL 12 MONTH) AND (NOW() - INTERVAL 11 MONTH) THEN l.qtyShipped ELSE 0 END) AS m12,
   SUM(CASE WHEN l.invDate BETWEEN (NOW() - INTERVAL 11 MONTH) AND (NOW() - INTERVAL 10 MONTH) THEN l.qtyShipped ELSE 0 END) AS m11,
   SUM(CASE WHEN l.invDate BETWEEN (NOW() - INTERVAL 10 MONTH) AND (NOW() - INTERVAL 9 MONTH) THEN l.qtyShipped ELSE 0 END) AS m10
FROM items i
LEFT JOIN invoiceLines l
ON l.itemCode = i.id
GROUP BY i.id

这里是demo，其中包含我创建的一些示例数据。

MySQL select语句返回多个SUM与多个WHERE

2 个答案: