Re: error in the example given for numeric data types

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: jian he <jian(dot)universality(at)gmail(dot)com>
Cc: Priyank Rajvansh <rajvansh(dot)priyank(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: error in the example given for numeric data types
Date: 2023-07-15 13:16:41
Message-ID: 3579168.1689427001@sss.pgh.pa.us
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jian he <jian(dot)universality(at)gmail(dot)com> writes:
>> practice=# create table t1(height numeric(3,5));
>> ERROR: NUMERIC scale 5 must be between 0 and precision 3

> it works in pg15, not in pg14.
> see my test: https://dbfiddle.uk/wgfjCx7j

Indeed. The quoted documentation text is different between v15 and prior
versions. Observe also the v15 release notes:

https://www.postgresql.org/docs/15/release-15.html

E.4.3.4. Data Types

Allow the scale of a numeric value to be negative, or greater than
its precision (Dean Rasheed, Tom Lane)

This allows rounding of values to the left of the decimal point,
e.g., '1234'::numeric(4, -2) returns 1200.

regards, tom lane

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