Oracle merge sql 在使用 where 条件更新时不起作用

Question

我的问题是当我用 where 条件更新时发生错误。

错误信息是00936。00000 - "missing expression"

如果我删除这一行 where q1.SALE_QTY <> -9 ，那么 sql 就可以了。

数据库版本：oracle 9i SQL:

merge into TBL_QTY q1
using (
select 'A111' as prod_no
       ,'BAT0000171624' as part_batch_no
       ,'172' as cond1_type
       ,'20201225' as beg_dt  
      ,'20201225' as end_dt
      , 17 as obtain_qty
      , 17 as sale_qty ) q2
      on　
(  q1.PROD_NO = q2.PROD_NO
  and q1.PART_BATCH_NO = q2.PART_BATCH_NO
  and q1.COND1_TYPE = q2.COND1_TYPE
  and q1.BEG_DT = q2.BEG_DT
  and q1.END_DT= q2.END_DT)
WHEN MATCHED THEN 
   update  SET q1.OBTAIN_QTY    = 15     
               ,q1.SALE_QTY      = 15 
               where q1.SALE_QTY <> -9
WHEN NOT MATCHED THEN
   INSERT (PROD_NO, PART_BATCH_NO, COND1_TYPE, BEG_DT
           ,END_DT , OBTAIN_QTY   , SALE_QTY           )
   VALUES (q2.PROD_NO, q2.PART_BATCH_NO, q2.COND1_TYPE, q2.BEG_DT
           ,q2.END_DT , q2.OBTAIN_QTY   , q2.SALE_QTY           );

Answer 1

实现相同行为的一种方法是在 MERGE 语句的 UPDATE 子句中使用 CASE..WHEN，如下所示。

...
...
WHEN MATCHED THEN 
   update  SET q1.OBTAIN_QTY = CASE WHEN q1.SALE_QTY <> -9 THEN 15 ELSE q1.OBTAIN_QTY END
               ,q1.SALE_QTY  = CASE WHEN q1.SALE_QTY <> -9 THEN 15 ELSE q1.SALE_QTY END
              -- where q1.SALE_QTY <> -9
WHEN NOT MATCHED THEN
...
...

干杯！！

Oracle merge sql 在使用 where 条件更新时不起作用

Oracle merge sql doesn't work when update with where condtions

oracle

oracle9i

sql-merge