order by 在联合子句中返回错误

Question

我正在使用这个查询，它在没有订购数据的情况下工作，但是在通过查询添加订单后返回错误

(SELECT * FROM bills INNER JOIN cats INNER JOIN suppliers
INNER JOIN new_cards
WHERE new_cards.`Card_Code` LIKE '%8%'
AND bills.`Sup_ID` = suppliers.`Sup_ID`
AND new_cards.`Sup_ID`  = suppliers.`Sup_ID`
AND cats.`Cat_ID` = bills.`Cat_ID`
AND bills.`Cat_ID` = cats.`Cat_ID`
AND new_cards.`Bill_ID` = bills.`Bill_ID`)
UNION
(SELECT * FROM bills INNER JOIN cats INNER JOIN suppliers
INNER JOIN sold_cards WHERE
sold_cards.`Card_Code` LIKE '%8%'
AND bills.`Sup_ID` = suppliers.`Sup_ID`
AND sold_cards.`Sup_ID`  = suppliers.`Sup_ID`
AND cats.`Cat_ID` = bills.`Cat_ID`
AND bills.`Cat_ID` = cats.`Cat_ID`
AND sold_cards.`Bill_ID` = bills.`Bill_ID`)
ORDER BY bills.`ID` DESC

这是错误 来自 SELECT 之一的表 'bills' 不能用于全局 ORDER 子句

Answer 1

首先，我建议您选择列名。这样，您就知道两个查询都返回相同数量的列。然后你可以ORDER BY ID DESC。

要让你的工作正常，请识别每个联合中的 bills id 列，然后按它排序（不引用表名）：

(SELECT bills.id billsid, <<other columns>> FROM bills INNER JOIN cats INNER JOIN suppliers
INNER JOIN new_cards
WHERE new_cards.`Card_Code` LIKE '%8%'
AND bills.`Sup_ID` = suppliers.`Sup_ID`
AND new_cards.`Sup_ID`  = suppliers.`Sup_ID`
AND cats.`Cat_ID` = bills.`Cat_ID`
AND bills.`Cat_ID` = cats.`Cat_ID`
AND new_cards.`Bill_ID` = bills.`Bill_ID`)
UNION
(SELECT bills.id billsid, <<other columns>> FROM bills INNER JOIN cats INNER JOIN suppliers
INNER JOIN sold_cards WHERE
sold_cards.`Card_Code` LIKE '%8%'
AND bills.`Sup_ID` = suppliers.`Sup_ID`
AND sold_cards.`Sup_ID`  = suppliers.`Sup_ID`
AND cats.`Cat_ID` = bills.`Cat_ID`
AND bills.`Cat_ID` = cats.`Cat_ID`
AND sold_cards.`Bill_ID` = bills.`Bill_ID`)
ORDER BY billsid DESC

---

就个人而言，我建议您将查询重写如下：

SELECT b.id billsid, other columns 
FROM bills b
    INNER JOIN cats c ON c.`Cat_ID` = b.`Cat_ID`
    INNER JOIN suppliers s ON b.`Sup_ID` = s.`Sup_ID`
    INNER JOIN new_cards nc ON nc.`Sup_ID`  = s.`Sup_ID` 
                               AND nc.`Bill_ID` = b.`Bill_ID`
WHERE nc.`Card_Code` LIKE '%8%'
UNION
SELECT b.id billsid, other columns
FROM bills b 
    INNER JOIN cats c ON c.`Cat_ID` = b.`Cat_ID`
    INNER JOIN suppliers s ON b.`Sup_ID` = s.`Sup_ID`
    INNER JOIN sold_cards sc ON sc.`Sup_ID`  = s.`Sup_ID` 
                              AND sc.`Bill_ID` = b.`Bill_ID`
WHERE sc.`Card_Code` LIKE '%8%'
ORDER BY billsid DESC