Oracle 11g 将 Invalid Identifier 与 INSERT VALUES 中的子查询合并

Question

我正在尝试在过程中使用MERGE，并在插入值中使用USING_SET 进行查询

MERGE 如下所示：

MERGE INTO N_CUSTOMER dest
   USING S_customer src 
    ON (dest.CUSTOMER_ID = src.CUSTOMER_ID)
    WHEN
     MATCHED THEN
     update set
     dest.DATE_OF_BIRTH = src.S_BIRTHDATE,
     dest.GENDER = src.S_GENDER,
     dest.NAME = src.S_NAME
     WHEN NOT MATCHED THEN
     INSERT (DATE_OF_BIRTH, GENDER, NAME, TOTAL_FOO_COUNT)
     VALUES (src.S_BIRTHDATE, src.S_GENDER, src.S_NAME, 
            (select count(f.FOO_ID) from S_FOO f where f.CUSTOMER_ID = src.CUSTOMER_ID));

我得到的错误是：

无效的 SQL 错误：ORA-00904：“SRC”。“CUSTOMER_ID”：子查询中的标识符无效（从 S_FOO f 中选择 count(f.FOO_ID)，其中 f.CUSTOMER_ID = src.CUSTOMER_ID）。

oracle 无法识别子查询中的“src”。有什么想法吗？

Answer 1

您可以使用outer variable：

declare 
o_variable number;

begin

select count(f.FOO_ID) 
into o_variable 
from S_FOO f where f.CUSTOMER_ID in (select CUSTOMER_ID from S_customer.CUSTOMER_ID);

MERGE INTO N_CUSTOMER dest
   USING S_customer src 
    ON (dest.CUSTOMER_ID = src.CUSTOMER_ID)
    WHEN
     MATCHED THEN
     update set
     dest.DATE_OF_BIRTH = src.S_BIRTHDATE,
     dest.GENDER = src.S_GENDER,
     dest.NAME = src.S_NAME
     WHEN NOT MATCHED THEN
     INSERT (DATE_OF_BIRTH, GENDER, NAME, TOTAL_FOO_COUNT)
     VALUES (src.S_BIRTHDATE, src.S_GENDER, src.S_NAME,o_variable);
end;

Answer 2

您可以在 src 本身中使用子查询，如下所示

MERGE INTO N_CUSTOMER dest
   USING 
    (
    select cus.*,k.cnt
    S_customer cus join
    (select count(f.FOO_ID) cnt ,CUSTOMER_ID 
        from S_FOO f group by CUSTOMER_ID ) k
    on cus.CUSTOMER_ID = k.CUSTOMER_ID 
    ) src 
    ON (dest.CUSTOMER_ID = src.CUSTOMER_ID)
    WHEN
     MATCHED THEN
     update set
     dest.DATE_OF_BIRTH = src.S_BIRTHDATE,
     dest.GENDER = src.S_GENDER,
     dest.NAME = src.S_NAME
     WHEN NOT MATCHED THEN
     INSERT (DATE_OF_BIRTH, GENDER, NAME, TOTAL_FOO_COUNT)
     VALUES (src.S_BIRTHDATE, src.S_GENDER, src.S_NAME, src.cnt);