Re: CONCAT function adding extra characters

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: AI Rumman <rummandba(at)gmail(dot)com>
Cc: pgsql-general General <pgsql-general(at)postgresql(dot)org>
Subject: Re: CONCAT function adding extra characters
Date: 2021-06-15 19:00:24
Message-ID: CAFj8pRDb4MevTh5kV7hsXbX9hszCt3Ca8hRrCOdOp9ag5H3HyQ@mail.gmail.com
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Hi

út 15. 6. 2021 v 20:56 odesílatel AI Rumman <rummandba(at)gmail(dot)com> napsal:

> 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?
>

this is strange

postgres=# select concat('41.1'::double precision,':', 20);
┌─────────┐
│ concat │
╞═════════╡
│ 41.1:20 │
└─────────┘
(1 row)

postgres=# select version();
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ version

╞═══════════════════════════════════════════════════════════════════════════════════════════════════════════╡
│ PostgreSQL 10.17 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 11.1.1
20210428 (Red Hat 11.1.1-1), 64-bit │
└───────────────────────────────────────────────────────────────────────────────────────────────────────────┘
(1 row)

Regards

Pavel

> Thanks.
>

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