如何在UNION ALL中设置UNION

Question

我正在尝试执行以下代码：

SELECT ItName, ItCode, Qty, Qt2, Qt3
FROM
(
SELECT A.ItName, A.ItCode, COUNT(B.Qty) AS 'Quantity 1', COUNT(B.Qty2) AS 'Quantity 2', 
COUNT(B.Qty3) AS 'Quantity 3' 
FROM tblitem A
INNER JOIN tblstocksummary B ON A.ItCode = B.ItCode
WHERE A.Itcode='IL001-000151'
GROUP BY A.ItCode
HAVING COUNT(B.Qty) !='0'AND COUNT(B.Qty2) !='0' AND COUNT(B.Qty3) !='0'
UNION
SELECT A2.ItName, A2.ItCode, COUNT(B2.Qty), COUNT(B2.Qty2), COUNT(B2.Qty3) FROM tblitem A2
INNER JOIN tblstocksummary B2 ON A2.ItCode = B2.ItCode
WHERE A2.Itcode='IL001-000373' 
GROUP BY A2.ItCode
HAVING COUNT(B2.Qty) !='0'AND COUNT(B2.Qty2) !='0' AND COUNT(B2.Qty3) !='0'
) t
UNION ALL
SELECT A3.ItName, A3.ItCode, COUNT(B3.Qty), COUNT(B3.Qty2), COUNT(B3.Qty3) FROM tblitem A3
INNER JOIN tblstocksummary B3 ON A2.ItCode = B3.ItCode
WHERE A3.Itcode='IL001-000166' 
GROUP BY A3.ItCode
HAVING COUNT(B3.Qty) !='0'AND COUNT(B3.Qty2) !='0' AND COUNT(B3.Qty3) !='0';

但我错了：

SQL错误(1054(：字段列表中的未知列"数量">

所以，我想要么我使用了错误的语法，要么我试图做一些不能做的事情。也许最有经验的人会立刻发现问题所在。

有人能帮我吗？感谢

Answer 1

对于三个不同的A.ItCode，您不需要三个不同选择查询来与union all组合，而是可以使用in子句通过单个选择查询获得三个不同产品。

SELECT A.ItCode, A.ItName, COUNT(B.Qty) 'Quantity', COUNT(B.Qty2) 'Quantity2', COUNT(B.Qty3) 'Quantity3'
FROM tblitem A
INNER JOIN tblstocksummary B ON A.ItCode = B.ItCode AND A.ItCode in ('IL001-000151','IL001-000373', 'IL001-000166')
GROUP BY A.ItCode 
HAVING 'Quantity' !='0' AND 'Quantity2' !='0' AND 'Quantity3' !='0'

Answer 2

因为有Quantity1Quantity2作为列而不是数量

也许试试这个

SELECT ItName, ItCode, Qty, Qt2, Qt3
FROM
(
SELECT A.ItName, A.ItCode, COUNT(B.Qty) AS 'Qty', COUNT(B.Qty2) AS 'Qty2', 
COUNT(B.Qty3) AS 'Qty3' 
FROM tblitem A
INNER JOIN tblstocksummary B ON A.ItCode = B.ItCode
WHERE A.Itcode='IL001-000151'
GROUP BY A.ItCode
HAVING COUNT(B.Qty) !='0'AND COUNT(B.Qty2) !='0' AND COUNT(B.Qty3) !='0'
UNION
SELECT A2.ItName, A2.ItCode, COUNT(B2.Qty), COUNT(B2.Qty2), COUNT(B2.Qty3) FROM tblitem A2
INNER JOIN tblstocksummary B2 ON A2.ItCode = B2.ItCode
WHERE A2.Itcode='IL001-000373' 
GROUP BY A2.ItCode
HAVING COUNT(B2.Qty) !='0'AND COUNT(B2.Qty2) !='0' AND COUNT(B2.Qty3) !='0'
) t
UNION ALL
SELECT A3.ItName, A3.ItCode, COUNT(B3.Qty), COUNT(B3.Qty2), COUNT(B3.Qty3) FROM tblitem A3
INNER JOIN tblstocksummary B3 ON A2.ItCode = B3.ItCode
WHERE A3.Itcode='IL001-000166' 
GROUP BY A3.ItCode
HAVING COUNT(B3.Qty) !='0'AND COUNT(B3.Qty2) !='0' AND COUNT(B3.Qty3) !='0';

Answer 3

您遇到的问题不仅仅是错误的别名：

这是正确的代码(没有错误的代码(：

SELECT ItName, ItCode, `Quantity 1`, `Quantity 2`, `Quantity 3`
FROM
(
SELECT A.ItName, A.ItCode, COUNT(B.Qty) AS 'Quantity 1', COUNT(B.Qty2) AS 'Quantity 2', 
COUNT(B.Qty3) AS 'Quantity 3' 
FROM tblitem A
INNER JOIN tblstocksummary B ON A.ItCode = B.ItCode
WHERE A.Itcode='IL001-000151'
GROUP BY  A.ItName, A.ItCode
HAVING COUNT(B.Qty) !='0'AND COUNT(B.Qty2) !='0' AND COUNT(B.Qty3) !='0'
UNION
SELECT A2.ItName, A2.ItCode, COUNT(B2.Qty), COUNT(B2.Qty2), COUNT(B2.Qty3) 
FROM tblitem A2
INNER JOIN tblstocksummary B2 ON A2.ItCode = B2.ItCode
WHERE A2.Itcode='IL001-000373' 
GROUP BY A2.ItName, A2.ItCode
HAVING COUNT(B2.Qty) !='0'AND COUNT(B2.Qty2) !='0' AND COUNT(B2.Qty3) !='0'
) t
UNION ALL
SELECT A3.ItName, A3.ItCode, COUNT(B3.Qty), COUNT(B3.Qty2), COUNT(B3.Qty3) FROM tblitem A3
INNER JOIN tblstocksummary B3 ON A3.ItCode = B3.ItCode
WHERE A3.Itcode='IL001-000166' 
GROUP BY A3.ItName, A3.ItCode
HAVING COUNT(B3.Qty) !='0'AND COUNT(B3.Qty2) !='0' AND COUNT(B3.Qty3) !='0';

• 我已将Qty, Qty2 and Qty3替换为'Quantity 1', 'Quantity 2', 'Quantity 3'
• 还用ON A3.ItCode = B3.ItCode替换了ON A2.ItCode = B3.ItCode，您可以看到您的表别名是此查询错误
• 我在每组中添加了一组ItName由

这是我的演示：演示

Answer 4

我试过了，它的效果就像我想要一样

SELECT A.ItCode 'Item Code', A.ItName 'Item Name', COUNT(B.Qty) 'Quantity', COUNT(B.Qty2) 'Quantity2', COUNT(B.Qty3) 'Quantity3'
FROM tblitem A
INNER JOIN tblstocksummary B ON A.ItCode = B.ItCode AND A.ItCode = 'IL001-000151'
GROUP BY A.ItCode 
HAVING 'Quantity' !='0' AND 'Quantity2' !='0' AND 'Quantity3' !='0'
UNION ALL 
SELECT A.ItCode, A.ItName, COUNT(B.Qty) 'Quantity', COUNT(B.Qty2) 'Quantity2', COUNT(B.Qty3) 'Quantity3'
FROM tblitem A
INNER JOIN tblstocksummary B ON A.ItCode = B.ItCode AND A.ItCode = 'IL001-000373'
GROUP BY A.ItCode 
HAVING 'Quantity' !='0' AND 'Quantity2' !='0' AND 'Quantity3' !='0'
UNION ALL
SELECT A.ItCode, A.ItName, COUNT(B.Qty) 'Quantity', COUNT(B.Qty2) 'Quantity2', COUNT(B.Qty3) 'Quantity3'
FROM tblitem A
INNER JOIN tblstocksummary B ON A.ItCode = B.ItCode AND A.ItCode = 'IL001-000166'
GROUP BY A.ItCode 
HAVING 'Quantity' !='0' AND 'Quantity2' !='0' AND 'Quantity3' !='0'

但我认为这个代码可以更短。但我不知道怎么缩短。有什么建议吗？