試圖把查詢內另一個查詢在phpMyAdmin

Question

我試圖使用查詢作爲另一個查詢的數據源，但我不斷從SELECT分析錯誤。我對SQL和phpmyadmin相當陌生，不確定爲什麼會發生此錯誤。繼承人我查詢我試圖做的事：

SELECT CUS_CODE, 
COUNT(LINE.INV_NUMBER) AS "Number of Invoices", 
AVG("Invoice Total") AS "Average Invoice Amount", 
MAX("Invoice Total") AS "Max Invoice Amount", 
MIN("Invoice Total") AS "Min Invoice Amount", 
Sum("Invoice Total") AS "Total Customer Purchases" 
FROM (SELECT CUS_CODE, LINE.INV_NUMBER AS INV_NUMBER, 
     Sum(LINE.LINE_UNITS*LINE.LINE_PRICE) AS "Invoice Total" 
     FROM INVOICE, LINE 
     WHERE INVOICE.INV_NUMBER = LINE.INV_NUMBER 
     GROUP BY CUS_CODE, LINE.INV_NUMBER) 
GROUP BY CUS_CODE; 

很抱歉，如果我的問題是不明確的，但我可以回答任何問題，以幫助它清除掉。

Answer 1

您的疑問：

SELECT CUS_CODE, 
    COUNT(LINE.INV_NUMBER) AS "Number of Invoices", 
    AVG("Invoice Total") AS "Average Invoice Amount", 
    MAX("Invoice Total") AS "Max Invoice Amount", 
    MIN("Invoice Total") AS "Min Invoice Amount", 
    Sum("Invoice Total") AS "Total Customer Purchases" 
FROM (
    SELECT CUS_CODE, 
     LINE.INV_NUMBER, 
     Sum(LINE.LINE_UNITS * LINE.LINE_PRICE) AS "Invoice Total" 
    FROM INVOICE, 
     LINE 
    WHERE INVOICE.INV_NUMBER = LINE.INV_NUMBER 
    GROUP BY CUS_CODE, INV_NUMBER 
    ) 
GROUP BY CUS_CODE; 

一對夫婦的問題在這裏：

1. 在你的外部查詢您引用LINE.INV_NUMBER但LINE表不可用在這方面。這是你想要的子查詢的INV_NUMBER。
2. 您的子查詢缺少別名，因此您無法在外部查詢中引用它。這隻會拋出沒有別名的錯誤。

固定：

SELECT t1.CUS_CODE, 
    COUNT(t1.INV_NUMBER) AS "Number of Invoices", 
    AVG(t1."Invoice Total") AS "Average Invoice Amount", 
    MAX(t1."Invoice Total") AS "Max Invoice Amount", 
    MIN(t1."Invoice Total") AS "Min Invoice Amount", 
    Sum(t1."Invoice Total") AS "Total Customer Purchases" 
FROM (
    SELECT CUS_CODE, 
     LINE.INV_NUMBER AS INV_NUMBER, 
     Sum(LINE.LINE_UNITS * LINE.LINE_PRICE) AS "Invoice Total" 
    FROM INVOICE, 
     LINE 
    WHERE INVOICE.INV_NUMBER = LINE.INV_NUMBER 
    GROUP BY CUS_CODE, 
     LINE.INV_NUMBER 
    ) as t1 
GROUP BY CUS_CODE;