Question

我被问到这个问题：

使用FROM子句中的子查询仅从中检索发票室＆＃39; H＆＃39;和发票金额大于10000并加入结果使用数字列的航次表。仅限项目检索联合结果的船名和发票金额。订购按发票金额。

所以，我做了这个：

SELECT chamber =
        (
            SELECT      chamber 
            FROM        invoices 
            INNER JOIN  voyages ON  chambers.chamber  ='H' 
                                AND chambers.invoice > 10000 
                                AND invoice.number=voyages.number
        ), 
        boatname, 
        invoice 
FROM    chambers, 
        voyages, 
        invoices 
WHERE   chambers.chamber = invoices.chamber, 
        invoices.number = voyages.number

这是商会表：

#   chamber   name
1     A      New York

这是发票表：

#   number  invoice chamber
1   8300    9189    A

然而它一直给我这个错误：Query failed: near ",": syntax error

Answer 1

您的指示说将子查询放在FROM子句中，并将其作为腔室列的赋值。你想要做的是：

SELECT b.boatname
        ,a.invoice 
FROM (SELECT number, invoice
        FROM invoices
        WHERE chamber = 'H'
            AND invoice > 10000) a
INNER JOIN voyages b ON a.number = b.number
ORDER BY a.invoice DESC

如何在MySQL的FROM子句中使用子查询？

1 个答案: