From: Niklas Johansson <spot@tele2.se>
To: Risto Tamme <risto@ektaco.ee>
Cc: pgsql-sql@postgresql.org
Subject: Re: Table constraints and INSERT
Date: Wed, 17 May 2006 12:49:38 +0200
Message-ID: <4FECA253-3236-4619-B317-765B4CBE9DDD@tele2.se> (raw)
In-Reply-To: <E763584E741976409B9F835B475B00FC1A5353@pe2850.EKTACO.local>
References: <E763584E741976409B9F835B475B00FC1A5353@pe2850.EKTACO.local>
On 17 maj 2006, at 08.42, Risto Tamme wrote:
> INSERT INTO "PART" ("P_PARTKEY","P_RETAILPRICE") VALUES(999,90109.89);
>
> but it fails: ERROR: new row for relation "PART" violates check
> constraint "PART_check"
The P_PARTKEY column is an integer, which means the expression
P_PARTKEY/10 will yield 99, *not* 99.9.
Try executing
SELECT 90000 + 999/10 + 999/10;
from psql or some GUI-utility; the result is 90108.
> When you check using your head or pocket calculator then this INSERT
> seems to be correct. Is it some floating point mystery?
> Is there some trick?
You must cast the integer column to a float or numeric, try:
SELECT 90000 + 999::numeric/10 + 999::numeric/100;
In your case:
CHECK ("P_RETAILPRICE" = (90000 + "P_PARTKEY"::numeric / 10 +
"P_PARTKEY"::numeric / 100)
Sincerely,
Niklas Johansson
Phone: +46-322-108 18
Mobile: +46-708-55 86 90
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To: pgsql-sql@postgresql.org
Cc: spot@tele2.se, risto@ektaco.ee
Subject: Re: Table constraints and INSERT
In-Reply-To: <4FECA253-3236-4619-B317-765B4CBE9DDD@tele2.se>
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