Question

我正在为大学练习编写一小段代码，但我无法让它发挥作用。只有当Anagrafica的行没有空字段时，我才想加入Cod上的Impiegato和Anagrafica行。然后，对于新临时表的每一行，我生成一个字符串（some_string），该字符串将是ReportImpiegato表中Report字段的值。我使用的是Oracle 11g和SQL Developer。提前感谢愿意提供帮助的每个人。： - ）

我的表是：

TABLE IMPIEGATO
COD NUMBER(4,0)
NOME    VARCHAR2(40 BYTE)
COGNOME VARCHAR2(40 BYTE)
DATA_ASSUNTO    DATE
STIPENDIO   NUMBER(8,2)
CAPO    NUMBER(4,0)

TABLE ANAGRAFICA
COD NUMBER(4,0)
DATAN   DATE
SESSO   CHAR(1 BYTE)
LUOGON  VARCHAR2(80 BYTE)
PROVN   CHAR(2 BYTE)

TABLE REPORTIMPIEGATO
COD NUMBER
REPORT  VARCHAR2(4000 BYTE)

我的代码是：

MERGE INTO ReportImpiegato R
USING (SELECT * FROM (
    (SELECT *
    FROM Anagrafica A
    WHERE (A.DATAN IS NOT NULL AND A.LUOGON IS NOT NULL AND A.PROVN IS NOT NULL AND A.SESSO IS NOT NULL)) A 
    JOIN
    (Impiegato I)
    ON (A.Cod = I.Cod)
  )) D
ON (R.Cod = D.Cod)
WHEN MATCHED THEN
    UPDATE SET R.Report = some_string
WHEN NOT MATCHED
    INSERT (Cod, Report) VALUES (D.Cod, some_string)

输出是：

Error starting at line : 1 in command -
MERGE INTO ReportImpiegato R
USING (SELECT * FROM (
        (SELECT * FROM Anagrafica A WHERE (A.DATAN IS NOT NULL AND A.LUOGON IS     NOT NULL AND A.PROVN IS NOT NULL AND A.SESSO IS NOT NULL)) A 
        JOIN
        (Impiegato I)
        ON (A.Cod = I.Cod)
      )) D
ON (R.Cod = D.Cod)
WHEN MATCHED THEN
    UPDATE SET R.Report = some_string
WHEN NOT MATCHED
    INSERT (Cod, Report) VALUES (D.Cod, some_string);
Error at Command Line : 14 Column : 5
Error report -
SQL Error: ORA-00905: missing keyword
00905. 00000 -  "missing keyword"
*Cause:    
*Action:

Answer 1

错误消息指向出现问题的行和字符。如果我运行的代码是在实际报告的问题中发布的（12,5），那就是INSERT。

您在错误的分支上错过了THEN：

...
WHEN NOT MATCHED THEN    --- THEN was missing!
    INSERT (Cod, Report) VALUES (D.Cod, some_string)

后续ORA-00904: "D"."COD": invalid identifier是因为您在select *子句中执行了using。如果你在它上面运行那个子查询，你最终会得到名为COD和COD_1的列，至少在SQL Developer中，除了来自两个连接表的所有其他列名之外;但它取决于客户。在合并中，似乎做了不同的事情。如果你这样做

MERGE INTO ReportImpiegato R
USING (SELECT A.COD FROM (

即。只选择你真正需要的列，这个问题就会消失。

（我不知道some_string应该来自哪里;它可能是您真实代码中的字面值。）

ORA-00905：合并语句中缺少关键字

1 个答案: