mysql - 另一个 1064 语法错误

Question

我只是不明白这个语法有什么问题。我在最后一行收到 #1064 语法错误。

SELECT b.id, b.lastname, b.name, c.balance, a.maxdebt, b.warndata, b.warndownload, b.warnupload, b.warndebt, b.cutoffdata, b.cutoffdownload, b.cutoffupload, b.cutoffdebt, b.data, b.download, b.upload, b.warning, b.access, b.cutoffstop
FROM (
SELECT customers.id AS id, SUM(tariffs.value) AS maxdebt
            FROM tariffs
            INNER JOIN assignments ON tariffs.id = assignments.tariffid
            INNER JOIN customers ON assignments.customerid = customers.id
            GROUP BY id
) a
LEFT JOIN (
SELECT customers.id AS id, UPPER(lastname) AS lastname, customers.name AS name, SUM(stats.upload+stats.download) AS data, SUM(stats.download) AS download, SUM(stats.upload) AS upload, cutoffstop, warndata, warndownload, warnupload, warndebt, cutoffdata, cutoffdownload, cutoffupload, cutoffdebt, warning, access
        FROM customers
        LEFT JOIN nodes ON customers.id = nodes.ownerid
        LEFT JOIN stats ON nodes.id = stats.nodeid
        LEFT JOIN customerwarnings ON customers.id = customerwarnings.id
    GROUP BY id
) b
LEFT JOIN (
SELECT customerid, SUM(cash.value) AS balance
        FROM cash
        GROUP BY customerid
) c ON a.id = b.id = c.customerid

我尝试使用 RIGHT JOINS 和 LEFT JOINS 连接表以查看是否存在差异，但它们给了我相同的错误。内部的不同查询本身工作得很好，但是当我在此查询中将它们连接在一起时，出现语法错误。有谁知道我应该做什么或不应该做什么？

错误:“#1064 - 您的 SQL 语法有错误；请检查与您的 MySQL 服务器版本对应的手册，了解第 21 行 '' 附近使用的正确语法”

Answer 1

这是 Multiple LEFT JOIN 的引用

SELECT b.id, b.lastname, b.name, c.balance, a.maxdebt, b.warndata, b.warndownload, b.warnupload, b.warndebt, b.cutoffdata, b.cutoffdownload, b.cutoffupload, b.cutoffdebt, b.data, b.download, b.upload, b.warning, b.access, b.cutoffstop
FROM (
SELECT customers.id AS id, SUM(tariffs.value) AS maxdebt
            FROM tariffs
            INNER JOIN assignments ON tariffs.id = assignments.tariffid
            INNER JOIN customers ON assignments.customerid = customers.id
            GROUP BY id
) a
LEFT JOIN (
SELECT customers.id AS id, UPPER(lastname) AS lastname, customers.name AS name, SUM(stats.upload+stats.download) AS data, SUM(stats.download) AS download, SUM(stats.upload) AS upload, customers.cutoffstop, warndata, warndownload, warnupload, warndebt, cutoffdata, cutoffdownload, cutoffupload, cutoffdebt, nodes.warning, nodes.access
        FROM customers
        LEFT JOIN nodes ON customers.id = nodes.ownerid
        LEFT JOIN stats ON nodes.id = stats.nodeid
        LEFT JOIN customerwarnings ON customers.id = customerwarnings.id
    GROUP BY id
) b ON a.id = b.id
LEFT JOIN (
SELECT customerid, SUM(cash.value) AS balance
        FROM cash
        GROUP BY customerid
) c ON a.id = c.customerid