MySQL、CROSS JOIN 和未知列

Question

我编写了使用子查询的 mysql 查询。我不明白为什么 mysql 在子查询中的“where 子句”中显示“未知列 'T.TICKETID'”。对于 MSSQL，它可以正常工作。

SELECT @PERIODTYPE := 'Y';


SELECT
  @PERIODTYPE,
  CASE 
    WHEN @PERIODTYPE = 'W' THEN DATE_FORMAT(R.DATENEW,'%u')
    WHEN @PERIODTYPE = 'M' THEN DATE_FORMAT(R.DATENEW,'%Y-%m')
    WHEN @PERIODTYPE = 'Y' THEN DATE_FORMAT(R.DATENEW,'%Y')
    ELSE DATE_FORMAT(R.DATENEW,'%Y-%m-%d') 
  END `Period`,
  DATE_FORMAT(MIN(R.DATENEW),'%Y-%m-%d') min_date,
  DATE_FORMAT(MAX(R.DATENEW),'%Y-%m-%d') max_date,
  COUNT(*) Transactions,
  SUM(SQ.`Sold Units`)  `Sold Units`,
  FORMAT(MAX(P.TOTAL), 2) `Largest Order`, 
  FORMAT(SUM(P.TOTAL), 2) `Total $ Sold`,
  FORMAT(SUM(TXL.AMOUNT), 2) `Total Tax $ Collected`
FROM RECEIPTS R INNER JOIN TAXLINES TXL ON R.ID = TXL.RECEIPT
                INNER JOIN TAXES TX ON TXL.TAXID = TX.ID 
                INNER JOIN TAXCATEGORIES TXC ON TX.CATEGORY = TXC.ID 
                INNER JOIN PAYMENTS P ON P.RECEIPT = R.ID
                INNER JOIN TICKETS T ON R.ID = T.ID  
                CROSS JOIN (SELECT SUM(TL.UNITS) 'Sold Units' FROM TICKETLINES TL WHERE T.TICKETID = TL.TICKET)  SQ
GROUP BY CASE 
    WHEN @PERIODTYPE = 'W' THEN DATE_FORMAT(R.DATENEW,'%u')
    WHEN @PERIODTYPE = 'M' THEN DATE_FORMAT(R.DATENEW,'%Y-%m')
    WHEN @PERIODTYPE = 'Y' THEN DATE_FORMAT(R.DATENEW,'%Y')
    ELSE DATE_FORMAT(R.DATENEW,'%Y-%m-%d')
  END
ORDER BY R.DATENEW

更新 1

我替换了表名 (TICKETS) 而不是别名 (T)。我有错误。请看截图。

SELECT @PERIODTYPE := 'D';


SELECT
  @PERIODTYPE,
  CASE 
    WHEN @PERIODTYPE = 'W' THEN DATE_FORMAT(R.DATENEW,'%u')
    WHEN @PERIODTYPE = 'M' THEN DATE_FORMAT(R.DATENEW,'%Y-%m')
    WHEN @PERIODTYPE = 'Y' THEN DATE_FORMAT(R.DATENEW,'%Y')
    ELSE DATE_FORMAT(R.DATENEW,'%Y-%m-%d') 
  END `Period`,
  DATE_FORMAT(MIN(R.DATENEW),'%Y-%m-%d') min_date,
  DATE_FORMAT(MAX(R.DATENEW),'%Y-%m-%d') max_date,
  COUNT(*) Transactions,
  FORMAT(SUM(IFNULL(SQ.`Sold Units`,0)),2)  `Sold Units`,
  FORMAT(MAX(P.TOTAL), 2) `Largest Order`, 
  FORMAT(SUM(P.TOTAL), 2) `Total $ Sold`,
  FORMAT(SUM(TXL.AMOUNT), 2) `Total Tax $ Collected`
FROM RECEIPTS R INNER JOIN TAXLINES TXL ON R.ID = TXL.RECEIPT
                INNER JOIN TAXES TX ON TXL.TAXID = TX.ID 
                INNER JOIN TAXCATEGORIES TXC ON TX.CATEGORY = TXC.ID 
                INNER JOIN PAYMENTS P ON P.RECEIPT = R.ID
                INNER JOIN TICKETS ON R.ID = TICKETS.ID 
--                LEFT JOIN (SELECT TL.TICKET, SUM(TL.UNITS) 'Sold Units' FROM TICKETLINES TL  GROUP BY TL.TICKET)  SQ ON T.ID = SQ.TICKET
                CROSS JOIN (SELECT SUM(TL.UNITS) 'Sold Units' FROM TICKETLINES TL WHERE  TICKETS.ID = SQ.TICKET)  SQ 

GROUP BY CASE 
    WHEN @PERIODTYPE = 'W' THEN DATE_FORMAT(R.DATENEW,'%u')
    WHEN @PERIODTYPE = 'M' THEN DATE_FORMAT(R.DATENEW,'%Y-%m')
    WHEN @PERIODTYPE = 'Y' THEN DATE_FORMAT(R.DATENEW,'%Y')
    ELSE DATE_FORMAT(R.DATENEW,'%Y-%m-%d')
  END
ORDER BY R.DATENEW

Answer 1

该查询在 mysql 中不起作用，因为 mysql 不能使用声明的别名和上级尊重子查询..

在交叉连接中的子查询中

CROSS JOIN (SELECT SUM(TL.UNITS) 'Sold Units' 
         FROM TICKETLINES TL WHERE T.TICKETID = TL.TICKET)  SQ

您使用 T.TICKETID

别名T

  INNER JOIN TICKETS T ON R.ID = T.ID  

在子查询范围内无法“访问”的地方声明..

如果可能的话，我建议你构建一个不引用 T 别名的子查询。尝试（如果可能）构建一个没有别名的等效子查询