SEO

-- Easy to duplicate on 3 different operating systems, by executing the
-- following script via psql -f pg83bug.sql

-- begin script pg83bug.sql

\set VERBOSITY verbose;

drop table if exists bugtab;

select version();

create table bugtab (
date timestamp without time zone not null
,pnum numeric
);

update bugtab set
pnum = -8.6
where date like '2007-01-19%';

-- end script pg83bug.sql

The error message reported on 3 different operating systems:

DROP TABLE

version
--------------------------------------------------------------------------------------------------------
PostgreSQL 8.3.0 on i686-redhat-linux-gnu, compiled by GCC gcc (GCC)
4.1.2 20070925 (Red Hat 4.1.2-33)
(1 row)

CREATE TABLE
psqlg83bug.sql:16: ERROR: operator does not exist: timestamp without
time zone ~~ unknown
LINE 3: where date like '2007-01-19%';
^
HINT: No operator matches the given name and argument type(s). You
might need to add explicit type casts.


DROP TABLE

version
-----------------------------------------------------------------------------------------------
PostgreSQL 8.3.1 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.2.3
(Ubuntu 4.2.3-2ubuntu4)
(1 row)

CREATE TABLE
psqlg83bug.sql:16: ERROR: operator does not exist: timestamp without
time zone ~~ unknown
LINE 3: where date like '2007-01-19%';
^
HINT: No operator matches the given name and argument type(s). You
might need to add explicit type casts.


DROP TABLE
version
-----------------------------------------------------
PostgreSQL 8.3.0, compiled by Visual C++ build 1400
(1 row)

CREATE TABLE
psqlg83bug.sql:16: ERROR: operator does not exist: timestamp without
time zone ~~ unknown at character 50
HINT: No operator matches the given name and argument type(s). You
might need to add explicit type casts.
psqlg83bug.sql:16: LINE 3: where date like '2007-01-19%';
psqlg83bug.sql:16:




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On Sat, Apr 12, 2008 at 4:53 AM, philwalk <nomaps@frii.com> wrote:
> CREATE TABLE
> psqlg83bug.sql:16: ERROR: operator does not exist: timestamp without
> time zone ~~ unknown
> LINE 3: where date like '2007-01-19%';
> ^
> HINT: No operator matches the given name and argument type(s). You
> might need to add explicit type casts.

This isn't a bug. 8.3 removes a bunch of implicit casts to text which
led to unappropriate behaviours. Prior to 8.3, your timestamp was
casted to text implicitely.

Just use date_trunc
(http://www.postgresql.org/docs/curre...atetime.html):
update bugtab set
pnum = -8.6
where date_trunc('day', date) = '2007-01-19';

You can add a functional index on date_trunc('day', date) if necessary.

--
Guillaume

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