Re: convert real to numeric.

On 10/18/18 3:28 AM, Alessandro Aste wrote:
> Hi,
>
>
>
> Postresql version: 10.5
>
> I need to convert an SQL field from real to numeric, but I’m getting a
> strange behavior.
>
> See the following query in preprod:
>
> select amount, amount::numeric, amount::numeric(16,4),
> amount::varchar::numeric from mytable where id = 32560545;
>
> Result:
>
> 17637.75, 17637.8, 17637.8000, 17637.75
>
> As you can see, the conversion to ::numeric is truncating the number to
> just 1 decimal digit.
>
> Also we tried to  change the schema definition of this table, from real
> to numeric, and the value was truncated.
>
> Is the ::varchar::numeric workaround a good option in your opinion? Any
> other ideas to fix this issue?

select 17637.75::real::numeric;
numeric
---------
17637.8

select 17637.75::float::numeric;
numeric
----------
17637.75

>
> Thank you,
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com