Re: CONCAT function adding extra characters

út 15. 6. 2021 v 21:07 odesílatel Tom Lane <tgl@sss.pgh.pa.us> napsal:

AI Rumman <rummandba@gmail.com> writes:
> 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

What have you got extra_float_digits set to?

postgres=# set extra_float_digits to 3;
SET
postgres=# select concat('41.1'::double precision,':', 20);
┌────────────────────────┐
│         concat         │
╞════════════════════════╡
│ 41.1000000000000014:20 │
└────────────────────────┘
(1 row)

Pavel

 

                        regards, tom lane