From: | "Brian Ceccarelli" <ceccareb(at)talussoftware(dot)com> |
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To: | pgsql-bugs(at)postgresql(dot)org |
Subject: | BUG #4999: select 'a' < 'A' is true, but should be false . . . |
Date: | 2009-08-20 20:24:53 |
Message-ID: | 200908202024.n7KKOrPp030815@wwwmaster.postgresql.org |
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Lists: | pgsql-bugs |
The following bug has been logged online:
Bug reference: 4999
Logged by: Brian Ceccarelli
Email address: ceccareb(at)talussoftware(dot)com
PostgreSQL version: 8.4.0 to 8.2.13
Operating system: Linux and XP
Description: select 'a' < 'A' is true, but should be false . . .
Details:
since the < and > comparison operators seem to be case insensitive:
select 'a' < 'Z'; -- true
select 'a' < 'z'; -- true
select 'A' < 'Z'; -- true
select 'A' < 'z'; -- true
select 'z' < 'A'; -- false
select 'z' < 'a'; -- false
select 'Z' < 'A'; -- false
select 'Z' < 'a'; -- false
Any case A is < any case Z implies case-insensitive compare. Which would
imply that 'a' = 'A', but 'a' < 'A' is true.
- - -
The operator equals is case sensitive.
The operator < and > are case-insensitive.
This is not consistent.
Most of the time, operator < and > are case-insenstive, until you compare
the upper and lower cases of the same letter.
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Next Message | Brian Ceccarelli | 2009-08-20 20:30:56 | BUG #5000: Optimizer does not use function-based index for an order by |
Previous Message | Dmitry Samokhin | 2009-08-20 14:27:54 | Re: BUG #4997: Expression evaluation rules |