Question

我有一个表table，其中包含id, name, position, capture_date, modified_date, comments列。我正在尝试做一个让我疯狂的简单upsert。当表为空时，必须插入，但当它不为空时，它必须更新具有相同位置的注释列行，如果它不同，则必须插入新行而不是更新现有行。当表为空时，我使用此merge语句来创建第一行。

这很好用。但是，第二行必须是

1, john, 2, 01-JUL-15, 23-JUL-15, 'world'

在这种情况下，除了位置值为2之外，数据几乎相同，因此必须插入新行而不是将现有行的位置更新为2。这就是我的合并声明正在做的事情。有任何想法可以解决这个问题。

    merge into customers a
using(select 1 as customer_id, 'john' as customer_name, '1' as position, '01-JUL-15' as capture_date, 
      sysdate as  modified_date, 'hello' as comments from dual) b
  on(a.customer_id=b.customer_id)
when matched then
update set a.customer_id = b.customer_id, a.customer_name = b.customer_name, 
a.position = b.position, a.capture_date= b.capture_date, a.modified_date = b.modified_date,
a.comments=b.comments
when not matched then
insert(a.customer_id, a.customer_name, a.position, a.capture_date, a.modified_date, a.comments)
values(b.customer_id, b.customer_name, b.position, b.capture_date, b.modified_date, b.comments)

我创建了sqlfiddle

Answer 1

经验教训：

1发布原始查询不是一些错误的代理。
2发布您收到的任何错误消息。

您收到的错误消息是：

ORA-38104: Columns referenced in the ON Clause cannot be updated: "A"."CUSTOMER_ID"

解决方案：从update子句中删除a.customer_id。

merge into customers a
using (select 1 as customer_id
             ,'john' as customer_name
             ,'1' as position
             ,'01-JUL-15' as capture_date
             ,sysdate as modified_date
             ,'hello' as comments
         from dual) b
on (a.customer_id = b.customer_id)
when matched then
   update
      set a.customer_name = b.customer_name
         ,a.position      = b.position
         ,a.capture_date  = b.capture_date
         ,a.modified_date = b.modified_date
         ,a.comments      = b.comments
when not matched then
   insert
      (a.customer_id
      ,a.customer_name
      ,a.position
      ,a.capture_date
      ,a.modified_date
      ,a.comments)
   values
      (b.customer_id
      ,b.customer_name
      ,b.position
      ,b.capture_date
      ,b.modified_date
      ,b.comments)

融入oracle

1 个答案: