Re: How to use outer join in update
От | Shoaib Mir |
---|---|
Тема | Re: How to use outer join in update |
Дата | |
Msg-id | bf54be870612080117t7c1676e7v184e2b09352fbfdc@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: How to use outer join in update (Alban Hertroys <alban@magproductions.nl>) |
Список | pgsql-general |
You can use a view for that join query and then create a rule over it to insert in the referenced tables for the inserts in view.
Thanks,
Shoaib
Thanks,
Shoaib
On 12/8/06, Alban Hertroys <alban@magproductions.nl> wrote:
Andrus wrote:
> In my current DBMS I can use
>
> create table t1 ( f1 int, f2 int );
> create table t2 ( f3 int, f4 int );
> update t1 set f1=t2.f3 from t1 left join t2 on t1.f2=t2.f4
That looks like a self-join on t1 without using an alias for the second
instance of t1.
I think you meant:
update t1 set f1=t2.f3 from t2 where f2 = t2.f4
--
Alban Hertroys
alban@magproductions.nl
magproductions b.v.
T: ++31(0)534346874
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7500 AK Enschede
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
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