Mysql 如何将此sql查询更改为子查询

显示每个客户库存请求中请求的每个产品的列表。显示客户名称、产品编号和所需数量。按客户名称和产品编号排序

我试过这个：

SELECT STOCK_REQUEST.requestNum, STOCK_REQUEST.clientNum, CLIENT.clientName, REQUEST_LIST.productNum, REQUEST_LIST.qtyRequested 
FROM STOCK_REQUEST, CLIENT, REQUEST_LIST 
WHERE CLIENT.clientNum = STOCK_REQUEST.clientNum 
AND REQUEST_LIST.requestNum = STOCK_REQUEST.requestNum 
ORDER BY CLIENT.clientName AND REQUEST_LIST.productNum

我得到这样的东西：

requestNum  clientNum   clientName  productNum  qtyRequested
2            2 [->]     David Liu       4            674
3            2 [->]     David Liu       5            66
1            1 [->]     Ian Peng        2            45
5            4 [->]     James Cameron   3            809
4            3 [->]     Mark Moris      1            164

但是要求说我们必须使用子查询，所以我尝试将其更改为：

SELECT CLIENT.clientName, REQUEST_LIST.productNum, REQUEST_LIST.qtyRequested 
FROM CLIENT, REQUEST_LIST 
WHERE CLIENT.clientNum IN (
    SELECT clientNum
    FROM STOCK_REQUEST)
    AND REQUEST_LIST.requestNum IN (
        SELECT requestNum
        FROM STOCK_REQUEST)
ORDER BY CLIENT.clientName AND REQUEST_LIST.productNum

但结果并不是我所期望的：

clientName  productNum  qtyRequested
David Liu       4           674
James Cameron   3           809
Mark Moris      5           66
David Liu       2           45
James Cameron   1           164
Mark Moris      4           674
James Cameron   5           66
Mark Moris      2           45
Ian Peng        3           809
James Cameron   4           674
Ian Peng        1           164
James Cameron   2           45
David Liu       3           809
Ian Peng        5           66
David Liu       1           164
Ian Peng        4           674
Mark Moris      3           809
David Liu       5           66
Ian Peng        2           45
Mark Moris      1           164

---

ORDER BY CLIENT.clientName和REQUEST_LIST.productNum不应该是ORDER BY CLIENT.clientName、REQUEST_LIST.productNum？？？@Octopus Paul-是的，两个查询的当前形式都将抛出语法错误。对于OP-对于第一个查询，您应该使用。在第二种情况下，您可以组合两个子查询，如WHERE clientNum、SELECT clientNum中的requestNum、STOCK中的requestNum\u REQUESTGreat，我得到了正确的结果，谢谢你们：