Re: How to define the limit length for numeric type?

Hello

> -----Original Message-----
> From: pgsql-general-owner(at)postgresql(dot)org [mailto:pgsql-general-owner(at)postgresql(dot)org] On Behalf Of vod vos
> Sent: Sonntag, 12. März 2017 08:01
> To: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
> Cc: pgsql-general <pgsql-general(at)postgresql(dot)org>
> Subject: Re: [GENERAL] How to define the limit length for numeric type?
>
> Maybe CHECK (goose >= 100 AND goose <= -100) works better, But if :
>
> INSERT INTO test VALUES (1, 59.2);
> INSERT INTO test VALUES (1, 59.24);
> INSERT INTO test VALUES (1, 59.26);
> INSERT INTO test VALUES (1, 59.2678);
>
> The INSERT action still can be done. What I want is just how to limit the length of the insert value, you can just
> type format like 59.22, only four digits length.

You may change (or extend) the CHECK condition using regexp:

SELECT 59.2::TEXT ~ '^[0-9]+\.[0-9]{2}$';
?column?
----------
f

SELECT 59.24::TEXT ~ '^[0-9]+\.[0-9]{2}$';
?column?
----------
t

SELECT 59.26::TEXT ~ '^[0-9]+\.[0-9]{2}$';
?column?
----------
t

SELECT 59.2678::TEXT ~ '^[0-9]+\.[0-9]{2}$';
?column?
----------
f

Of course you can change the part left of the dot to also be limited to 2 digits.

Regards
Charles

>
> Thank you.
>
>
> ---- On 星期六, 11 三月 2017 22:25:19 -0800 Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote ---- > > > 2017-03-12
> 7:14 GMT+01:00 vod vos <vodvos(at)zoho(dot)com>:
> >
> > Hi everyone,
> >
> > How to define the exact limit length of numeric type? For example, > > CREATE TABLE test (id serial, goose
> numeric(4,1)); > > 300.2 and 30.2 can be inserted into COLUMN goose, but I want 30.2 or 3.2 can not be inserted,
> how to do this?
> >
> > ostgres=# CREATE TABLE test (id serial, goose numeric(4,1));CREATE TABLETime: 351,066 mspostgres=# insert into
> test values(1,3.2);INSERT 0 1Time: 65,997 mspostgres=# select * from test;┌────┬───────┐│ id │ goose
> │╞════╪═══════╡│ 1 │ 3.2 │└────┴───────┘(1 row)Time: 68,022 ms
> > Regards
> > Pavel
> > Thank you.
> >
> >
> >
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