Question

我正在尝试在apex 4.0的交互式报表中执行此查询，并且我不断收到以下错误：

The report query needs a unique key to identify each row. The supplied key cannot be used for this query. Please edit the report attributes to define a unique key column. ORA-01446: cannot select ROWID from, or sample, a view with DISTINCT, GROUP BY, etc.

如果我删除该组，则会抛出一个错误，询问group by，这是SQL：

SELECT
D.DTITLE,
COUNT(DCOPY.DID) as Stock
FROM RENT
LEFT JOIN D ON RENT.DID = D.DID
LEFT JOIN DCOPY ON RENT.DID = DCOPY.DID
WHERE RENT.ID IS NULL
GROUP BY D.DTITLE

表D：

Column Name Data Type   Nullable    Default Primary Key
DID VARCHAR2(10)    No  -   1
RATEID  VARCHAR2(10)    No  -   -
DESC    VARCHAR2(40)    No  -   -
DTITLE  VARCHAR2(40)    No  -   -

表租：

Column Name Data Type   Nullable    Default Primary Key
RENTID  VARCHAR2(10)    No  -   1
DUSERID VARCHAR2(10)    No  -   -
PRIORITYID  VARCHAR2(10)    No  -   -
DID VARCHAR2(10)    Yes -   -
DISPLAYID   VARCHAR2(10)    Yes -   -
DISPLAYDATE DATE    Yes -   -
DCOPYID VARCHAR2(10)    Yes -   -

Answer 1

您的查询没问题，您需要指定一个唯一列，该列可用作每行上的链接以查看相应的行详细信息或删除链接选项。默认情况下，报告假定您希望每行上都有链接以查看相应的行详细信息（单个记录视图）。

Answer 2

您的查询在语法上不正确（表别名不正确）。也许如果查询是固定的，那么代码将起作用：

SELECT D.DTITLE, COUNT(dc.DID) as Stock
FROM RENT r LEFT JOIN
     DVD d
     ON r.DID = D.DID LEFT JOIN
     DVDCOPY dc
     ON r.DVDID = dc.DID
WHERE r.ID IS NULL
GROUP BY D.DTITLE;

Apex不喜欢我的COUNT / GROUP BY sql

2 个答案: