将update / insert转换为Merge时出错

Question

我有一个upadate插入SCD查询，我试图转换为合并到如下：

    UPDATE A FROM X.CUSTOMER A,Y.T_CIF_CIS_CUSTOMER B
SET 
        EFFECTIVE_END_DATE =  CAST('2016-05-11' AS DATE FORMAT 'YYYYMMDD'),
        DW_UPD_LOAD_TIMESTAMP = Current_timestamp(6)
WHERE 
        COALESCE(TRIM(B.UNIQUE_ID_IN_SOURCE_SYSTEM),'') = COALESCE(TRIM(A.UNIQUE_ID_IN_SOURCE_SYSTEM),'')
                                AND A.EFFECTIVE_END_DATE= '2016-05-11'
        AND B.EFFECTIVE_END_DATE<> '3499-12-31'
                                AND A.FILE_ID=B.FILE_ID
                                AND A.COUNTRY_CODE=B.COUNTRY_CODE
;


INSERT X.CUSTOMER 
(col1,col2)
SELECT 
col1, col2
FROM Y.T_CIF_CIS_CUSTOMER SRC1
WHERE 
     EFFECTIVE_START_DATE = '2016-05-11'
    AND EFFECTIVE_END_DATE= '3499-12-31'

我正在使用以下合并声明：

    merge INTO X.CUSTOMER TGT
using Y.T_CIF_CIS_CUSTOMER SRC on 
   COALESCE(TRIM(SRC.UNIQUE_ID_IN_SOURCE_SYSTEM),'') = COALESCE(TRIM(TGT.UNIQUE_ID_IN_SOURCE_SYSTEM),'')
                                AND TGT.EFFECTIVE_END_DATE= '2016-05-11'
        AND SRC.EFFECTIVE_END_DATE<> '3499-12-31'
                                AND TGT.FILE_ID=SRC.FILE_ID
                                AND SRC.COUNTRY_CODE=SRC.COUNTRY_CODE
                                when matched  then update  
                                SET    EFFECTIVE_END_DATE =  CAST('2016-05-11' AS DATE FORMAT 'YYYYMMDD'),
        DW_UPD_LOAD_TIMESTAMP = Current_timestamp(6)

        WHEN NOT MATCHED THEN INSERT values(
        SRC.CUSTOMER_ID,
SRC.CUSTOMER_LIFE_CYCLE_TYPE_ID...
)


/*WHERE 
                EFFECTIVE_START_DATE = '2016-05-11'
    AND EFFECTIVE_END_DATE= '3499-12-31'
;
  */

任何人都可以告诉我哪里出错了。是否必须在这里使用PI作为搜索条件？