From: | Julien Rouhaud <rjuju123(at)gmail(dot)com> |
---|---|
To: | Firthouse banu <penguinsfairy(at)gmail(dot)com> |
Cc: | "pgsql-admin(at)postgresql(dot)org" <pgsql-admin(at)postgresql(dot)org> |
Subject: | Re: Equivalent of or condition in where clause |
Date: | 2021-04-01 09:02:44 |
Message-ID: | 20210401090244.xqy3w5yxvfkm4uxj@nol |
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Thread: | |
Lists: | pgsql-admin |
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?
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t
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