Re: Pgsql error in coalesce

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От Chamath Sajeewa
Тема Re: Pgsql error in coalesce
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Msg-id CACpofehvF5i2SdGOktfR7-HiJOtmfpq2aX+_yJ=efC7xZ3L0YQ@mail.gmail.com
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Ответ на RE: Pgsql error in coalesce  (Stephen Froehlich <s.froehlich@cablelabs.com>)
Ответы RE: Pgsql error in coalesce
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Hi,
Query is working properly when column_name::integer is used. I wonder Why is it required when column type is already set to int4. Any idea?

On Mon, 27 Jul 2020, 22:35 Stephen Froehlich, <s.froehlich@cablelabs.com> wrote:

What do you get with the following two type castings:

 

SELECT coalesce(column_name::integer, 255); ?

SELECT coalesce(column_name, ‘255’::text)::integer; ?

 

“integer” might actually be “smallint” if you’re only going to 255.

 

--Stephen

 

From: Chamath Sajeewa <csgsajeewa@gmail.com>
Sent: Monday, July 27, 2020 10:51
To: pgsql-novice@lists.postgresql.org
Subject: Pgsql error in coalesce

 

Hi,

There is table with int4 column. When select query is executed as "select coalesce(column_name, 255), query is failing with below error.

"COALESCE types text and integer cannot be mached".

Any idea?

Thank You!!

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