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Re: UPDATE with multiple WHERE conditions

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On 6/12/24 15:48, Ron Johnson wrote:
On Wed, Jun 12, 2024 at 5:28 PM Rich Shepard <rshepard@xxxxxxxxxxxxxxx> 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 = 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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