Question

SELECT 
    C.C_CODE, I.INV_NUM, I.INV_DATE, P.DESCRIPT, L.L_UNITS, L.L_PRICE
FROM 
    CUSTOMER C 
JOIN 
    (SELECT * 
     FROM INVOICE I
     JOIN 
         (SELECT * 
          FROM LINE L
          JOIN (SELECT * FROM PRODUCT) P ON P.P_CODE = L.P_CODE) LP ON I.INV_NUM = LP.INV_NUM
          ORDER BY I.INV_NUM DESC) ILP ON C.C_CODE = ILP.C_CODE
ORDER BY 
    C.C_CODE;

这是我得到的错误：

ORA-00904：＆＃34; L＆＃34;。＆＃34; L_PRICE＆＃34;：无效的标识符
00904. 00000 - ＆＃34;％s：无效标识符

Answer 1

您已经重新划分了表名，因此表L在上部选择级别不再可用您应该使用已分配给与L_PRICE列相关的选择的正确（最后）（ILP）表名称

或您的表格中没有L_PRICE列

    SELECT 
        C.C_CODE, I.INV_NUM, I.INV_DATE, P.DESCRIPT, L.L_UNITS, L.L_PRICE
    FROM 
        CUSTOMER C 
    JOIN 
        (SELECT * 
             FROM INVOICE I
             JOIN 
                    (SELECT * 
                      FROM LINE L
                      JOIN (SELECT * FROM PRODUCT) P ON P.P_CODE = L.P_CODE
                    ) LP ON I.INV_NUM = LP.INV_NUM
                  ORDER BY I.INV_NUM DESC
        ) ILP ON C.C_CODE = ILP.C_CODE
    ORDER BY 
        C.C_CODE;

Answer 2

表别名L在子查询中只有范围。

您的子查询具有别名ILP;用那个：

SELECT ..., ILP.L_STATUS

任何人都可以告诉我为什么我收到ora-00904的错误？

2 个答案: