Thread: BUG #3661: Missing equality comparator: string = integer

The following bug has been logged online:

Bug reference:      3661
Logged by:          David Bachmann
Email address:      david.bachmann@ersystems.ch
PostgreSQL version: 8.3-beta1
Operating system:   Windows XP
Description:        Missing equality comparator: string = integer
Details:

This does not function any more under PG 8.3-beta1:

select '5'::varchar = 5;
ERROR:  operator does not exist: character varying = integer

select '5'::char = 5;
ERROR:  operator does not exist: character = integer


Note that this still works:
select '5' = 5;

Am Dienstag, 9. Oktober 2007 schrieb David Bachmann:
> This does not function any more under PG 8.3-beta1:
>
> select '5'::varchar = 5;
> ERROR:  operator does not exist: character varying = integer

That is intentional.  Fix your application by inserting appropriate explicit
casts.

--
Peter Eisentraut
http://developer.postgresql.org/~petere/

>
> This does not function any more under PG 8.3-beta1:
>
> select '5'::varchar = 5;
> ERROR:  operator does not exist: character varying = integer
>
> select '5'::char = 5;
> ERROR:  operator does not exist: character = integer

you cannot compare any character type and numeric type. If you wont to
do, you have to cast to text or use function to_char or to_numeric.

>
>
> Note that this still works:
> select '5' = 5;
>

It is integer = integer. Value in apostrophes doesn't mean 100% char
or varchar in Postgres. Pg detects unknown type (in apostrophes)
accordance with know type (integer)

try:
postgres=# select '5.0'=5;
ERROR:  invalid input syntax for integer: "5a"

postgres=# select '5.0'=5;
ERROR:  invalid input syntax for integer: "5.0"
postgres=# select '5.0'=5.0;
 ?column?
----------
 t
(1 row)

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