From: | "Chris Gernon" <kabigon(at)gmail(dot)com> |
---|---|
To: | pgsql-bugs(at)postgresql(dot)org |
Subject: | BUG #6217: to_char() gives incorrect output for very small float values |
Date: | 2011-09-20 17:17:47 |
Message-ID: | 201109201717.p8KHHlZU087195@wwwmaster.postgresql.org |
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Lists: | pgsql-bugs |
The following bug has been logged online:
Bug reference: 6217
Logged by: Chris Gernon
Email address: kabigon(at)gmail(dot)com
PostgreSQL version: 9.1.0
Operating system: Windows XP
Description: to_char() gives incorrect output for very small float
values
Details:
The to_char() function gives incorrect output for float values whose decimal
expansion has several digits (more than somewhere around 14-15) after the
decimal point.
To reproduce:
CREATE TABLE t (
id serial,
f double precision,
CONSTRAINT t_pk PRIMARY KEY (id)
);
INSERT INTO t (f) VALUES (0.0000000000000000000000000000000563219288);
----------------------------------------
SELECT to_char(f,
'FM999990.99999999999999999999999999999999999999999999999999') FROM t WHERE
id = 1;
Expected Output:
0.0000000000000000000000000000000563219288
Actual Output:
0.
----------------------------------------
SELECT to_char(f,
'999990.99999999999999999999999999999999999999999999999999') FROM t WHERE id
= 1;
Expected Output:
0.00000000000000000000000000000005632192880000000000
Actual Output:
0.00000000000000
----------------------------------------
From | Date | Subject | |
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Next Message | Kevin Grittner | 2011-09-20 17:39:57 | Re: BUG #6217: to_char() gives incorrect output for very small float values |
Previous Message | Lionel Elie Mamane | 2011-09-20 16:05:55 | BUG #6216: Calling PQconnectdbParams from C++ with a char** |