在9i中使用MERGE [英] using MERGE in 9i

问题描述

我想在9i中做这样的事情

I want to do something like this in 9i

MERGE INTO SAT_DEMANDS D
      USING (SELECT DISTINCT d1.PRODUCT_ID AS product_id, CA.CUST_ID as allocated_cust  
        FROM CDP_MPS_ALLOCATION CA, sat_demands d1
        WHERE substr(d1.product_id,1,instr(d1.product_id,'_VIRTUAL',1)-1) = ca.prod_id(+)) MC
        ON (D.PRODUCT_ID = MC.product_id AND D.CUSTOMER_ID = MC.allocated_cust)
        WHEN matched then 
        Update set D.alloc_cust_id_s = CASE WHEN mc.allocated_cust IS NULL THEN 'FREE'
                                       ELSE mc.allocated_cust||':'||'FREE'
                                       END;

请帮助！ Oracle 9i不允许我这样做，因为在不匹配时它没有.我如何在9i中获得相同的结果?

Please help! Oracle 9i does not allow me to do this since it does not have when not matched. how do I achieve the same result in 9i?

推荐答案

使用rowid方法:

FOR r in (SELECT D.rowid, MC.allocated_cust FROM
           (SELECT DISTINCT d1.PRODUCT_ID AS product_id, CA.CUST_ID as allocated_cust  
               FROM CDP_MPS_ALLOCATION CA, sat_demands d1
             WHERE substr(d1.product_id,1,instr(d1.product_id,'_VIRTUAL',1)-1) = ca.prod_id(+)
            ) MC
            join SAT_DEMANDS D
            ON (D.PRODUCT_ID = MC.product_id AND D.CUSTOMER_ID = MC.allocated_cust)
         )
LOOP

        Update SAT_DEMANDS D
        set D.alloc_cust_id_s = CASE WHEN r.allocated_cust IS NULL THEN 'FREE'
                                     ELSE r.allocated_cust||':'||'FREE'
                                       END
        where rowid=r.rowid;
END LOOP;

这篇关于在9i中使用MERGE的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！