MySql：在子查询中引用主查询中的列

下表应反映的是 采购，在不同的时间收到部分采购。（我省略了日期栏。）

假设purchase 10分为三部分，分别存放在两个不同的位置（5和6）

现在我想选择那些有超过2000公斤（数量）的存货。这可以通过

SELECT stockId AS id, SUM(quantity) AS q
FROM stock
WHERE purchaseNo=10
GROUP BY stockId
HAVING q>2000

但是因为我只对stockId感兴趣，所以我也希望避免退回数量。这可能吗？ 我失败的尝试之一是

SELECT stockId AS id
FROM stock
WHERE purchaseNo=10 AND (SELECT SUM(quantity) FROM stock WHERE purchaseNo=10 AND stockId=id) >2000

带或不带GROUP BY返回以下错误：

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错误1054（42S22）：“where子句”中的未知列“id”

您可以将

总和

传递给

HAVING

，并从结果中跳过它

SELECT stockId AS id
FROM stock
WHERE purchaseNo=10
GROUP BY stockId
HAVING SUM(quantity)>2000;

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示例。

您尝试过类似的方法吗

SELECT distinct S1.stockId AS S1.id from stock S1
inner join(
SELECT S2.stockId AS S2.id, SUM(S2.quantity) AS S2.q
FROM stock S2
WHERE S2.purchaseNo=10
GROUP BY S2.stockId
HAVING S2.q>2000)
on S1.stockId=S2.stockId

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从查询中删除作为q的总和（数量）。主键是什么？好！就这么简单！谢谢你，彼得。

SELECT stockId AS id
FROM stock
WHERE purchaseNo=10
GROUP BY stockId
HAVING SUM(quantity)>2000;

SELECT distinct S1.stockId AS S1.id from stock S1
inner join(
SELECT S2.stockId AS S2.id, SUM(S2.quantity) AS S2.q
FROM stock S2
WHERE S2.purchaseNo=10
GROUP BY S2.stockId
HAVING S2.q>2000)
on S1.stockId=S2.stockId