匹配时插入合并

Question

我试过这个sql

merge into params t
using (
    select '9158075153713931109' ATTR_ID, '9158310272413033579' OBJECT_ID,
'9158075157713931109' LIST_VALUE_ID
from dual
    where exists (select * from attributes where attr_id = 9158075153713931109)
       ) v
on (t.object_id = v.object_id)
when matched then insert (attr_id, object_id, list_value_id, show_order) values(v.attr_id,v.object_id, v.LIST_VALUE_ID,1);

这里我只需要在 attr_id (9158075153713931109) 存在时将值插入到参数中。我只知道更新和删除与“匹配时”一起使用请帮助我如何使用 merge 执行此操作。

Answer 1

I need to insert the value into params only when attr_id (9158075153713931109) exists

我看不到 merge 声明的意义。据我了解你的问题，你的要求翻译为：

insert int params (attr_id, object_id, list_value_id, show_order) 
select s.*, 1
from (select '9158075153713931109' attr_id, '9158310272413033579' object_id, '9158075157713931109' list_value_id from dual) s 
where exists (select 1 from attributes a where a.attr_id = s.attr_id)

匹配时插入合并

when matched then insert in merge

sql

oracle

subquery

sql-update

sql-insert