AP_MergeSql

SELECT 'Rows updated:',COUNT(1) FROM (SELECT 1 FROM DELTA.PRMCN WHERE ETL_FLAG IN ('A','D')) S;

--重跑：删除已跑入数据
DELETE FROM CCRD.PRMCN WHERE JOB_SEQ_ID= New_JOB_SEQ_ID;

--重跑：从历史表恢复数据
INSERT INTO CCRD.PRMCN(CATEGORY,CATE_DESC,CURR_NUM2,PROC_DAYS,BRANCH,PDCAT_FLAG,EFF_DT,END_DT,JOB_SEQ_ID)
select CATEGORY,CATE_DESC,CURR_NUM2,PROC_DAYS,BRANCH,PDCAT_FLAG,EFF_DT,END_DT,JOB_SEQ_ID
from ODSHIS.PRMCN WHERE NEW_JOB_SEQ_ID= New_JOB_SEQ_ID;

--重跑：删除已跑入历史数据
DELETE FROM ODSHIS.PRMCN WHERE NEW_JOB_SEQ_ID= New_JOB_SEQ_ID;

--备份数据到历史表
SELECT 'Rows readed:',COUNT(1),'Rows changed:',COUNT(1) FROM (SELECT 1 FROM DELTA.PRMCN WHERE ETL_FLAG IN ('I','A','D')) S;
SELECT 'Rows updated:',COUNT(1) FROM NEW TABLE (
INSERT INTO ODSHIS.PRMCN(CATEGORY,CATE_DESC,CURR_NUM2,PROC_DAYS,BRANCH,PDCAT_FLAG,EFF_DT,END_DT,JOB_SEQ_ID,NEW_JOB_SEQ_ID)
select CATEGORY,CATE_DESC,CURR_NUM2,PROC_DAYS,BRANCH,PDCAT_FLAG,EFF_DT,END_DT,JOB_SEQ_ID,New_JOB_SEQ_ID
from CCRD.PRMCN T
WHERE T.END_DT='9999-12-31' AND EXISTS ( SELECT 1 FROM DELTA.PRMCN S
WHERE T.CATEGORY=S.CATEGORY )
);

--断链
MERGE INTO CCRD.PRMCN T 
USING (SELECT * FROM DELTA.PRMCN WHERE ETL_FLAG IN ('I','D','A')) S
ON T.CATEGORY=S.CATEGORY  AND T.END_DT='9999-12-31'
WHEN MATCHED THEN UPDATE SET 
T.END_DT='#DATEOFDATA#', T.JOB_SEQ_ID= New_JOB_SEQ_ID;

--加链
INSERT INTO CCRD.PRMCN(CATEGORY,CATE_DESC,CURR_NUM2,PROC_DAYS,BRANCH,PDCAT_FLAG,EFF_DT,END_DT,JOB_SEQ_ID)
select CATEGORY,CATE_DESC,CURR_NUM2,PROC_DAYS,BRANCH,PDCAT_FLAG,'#DATEOFDATA#','9999-12-31',New_JOB_SEQ_ID
from DELTA.PRMCN where ETL_FLAG in ('A','I');

--保持数据完整性
MERGE INTO CCRD.PRMCN T 
USING (SELECT * FROM DELTA.PRMCN WHERE ETL_FLAG = 'D' ) S
ON T.CATEGORY=S.CATEGORY 
WHEN NOT MATCHED THEN 
INSERT (CATEGORY,CATE_DESC,CURR_NUM2,PROC_DAYS,BRANCH,PDCAT_FLAG,EFF_DT,END_DT,JOB_SEQ_ID)
VALUES (CATEGORY,CATE_DESC,CURR_NUM2,PROC_DAYS,BRANCH,PDCAT_FLAG,'#DATEOFDATA#','#DATEOFDATA#',New_JOB_SEQ_ID);

以上就是对数据进行做拉链加载