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help / color / mirror / Atom feedFrom: Rob Sargent <[email protected]>
To: [email protected]
Subject: Re: UPDATE with multiple WHERE conditions
Date: Wed, 12 Jun 2024 16:05:26 -0600
Message-ID: <[email protected]> (raw)
In-Reply-To: <CANzqJaB48SjPZrOqEn-wawob+GfKQrwLouyNP_zoPW_5QsvFFw@mail.gmail.com>
References: <[email protected]>
<CANzqJaB48SjPZrOqEn-wawob+GfKQrwLouyNP_zoPW_5QsvFFw@mail.gmail.com>
On 6/12/24 15:48, Ron Johnson wrote:
> On Wed, Jun 12, 2024 at 5:28 PM Rich Shepard
> <[email protected]> wrote:
>
> I have a table with 3492 rows. I want to update a boolean column from
> 'false' to 'true' for 295 rows based on the value of another column.
>
> Is there a way to access a file with those condition values? If
> not, should
> I create a temporary table with one column containing those
> values, or do I
> write a psql script with 295 lines, one for each row to be updated?
>
>
> A plain UPDATE might work.
> UPDATE to_be_updated a
> SET bool_col = true
> FROM other_table b
> WHERE a.pk <http://a.pk; = b.pk <http://b.pk;
> AND b.field3 = mumble;
>
> (You can join them, right?)
Add "begin;" to that and try it. If you don't get exactly UPDATE 295
reported, then "rollback;";
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