Re: Equivalent of or condition in where clause

I agree with you.
Thanks Julien.

More suggestions are welcome.
Thanks

On Thu, 1 Apr 2021 at 2:32 PM, Julien Rouhaud <rjuju123(at)gmail(dot)com> wrote:

> On Thu, Apr 01, 2021 at 02:11:12PM +0530, Firthouse banu wrote:
> > Hi all,
> >
> > Need a suggestion. I have a update query in Postgres which is equivalent
> to
> > below example. Since query is having multiple or conditions and our
> tables
> > are very large it’s taking forever to run. Can you guys suggest me what
> can
> > be replaced with or condition in below example.
> >
> > Update table_name IA set
> > Column_1 = SC. Column_1,
> > Column_2 = SC. Column_2,
> > Column_3 = SC. Column_3
> > From (select statement ) SC
> > Where
> > IA. Column4=! SC. Column4 or
> > IA.column5 = ! SC. Column5 or
> > IA.column6 = ! SC. Column6 or
> > IA.column7 = ! SC. Column7
> > And IA. Column8 = SC. Column8
> > And IA. Column9 = SC. Column9;
>
> I don't think this query is doing what you think it's doing. You should
> probably put parenthesis around the OR-ed predicates if you don't want this
> behavior:
>
> select 1 != 2 or 2 != 3 and 3 = 4 and 4 = 5;
> ?column?
> ----------
> t
>