Re: CONCAT function adding extra characters

On 6/15/21 1:55 PM, AI Rumman wrote:
> I am using Postgresql 10 and seeing a strange behavior in CONCAT function
> when I am concatenating double precision and int with a separator.
>
> select concat('41.1'::double precision,':', 20);
> Result:
> 41.1000000000000014:20
>
>
> Value 41.1 which double precision converts to 41.1000000014.
>
> Is that expected?

Because of the well-known difficulty in precisely converting floating point
to decimal, in cases like this, I always cast to NUMERIC of the desired
precision.  It's the COBOL programmer in me...

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