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Ascending descending
Posted by: Marcelo Stucky ()
Date: September 26, 2006 02:12AM

Hello there
I've got a strange situation
the same query one with order by surname (default ASC)
and one with order by surname DESC
and get 2 and 3 records respectively


it has definatly a relation to the order by clause but why?



mysql> SELECT p.p_id,p.surname,p.name,p.company ,t1.telefon as telhome,t2.telefon as telwork FROM persons p LEFT JOIN contact t1 on p.p_id=t1.p_id and t1.con_Type='work' LEFT JOIN contact t2 on p.p_id=t2.p_id and t2.con_Type='home' WHERE p.surname like 'stu%' ORDER BY p.surname;
+------+-------------+-----------+-------------------+-------------------+----------------+
| p_id | surname | name | company | telhome | telwork |
+------+-------------+-----------+-------------------+-------------------+----------------+
| 1603 | Stub##### | #ohn E.G. | #############ITED | ########### 9111 | NULL |
| 36 | Stuc### | #ar## | #### | ########## 123 | ###########-55 |
+------+-------------+-----------+-------------------+-------------------+----------------+

and now ordering DESC
retrives one record more (p_id=5520)


mysql> SELECT p.p_id,p.surname,p.name,p.company ,t1.telefon as telhome,t2.telefon as telwork FROM persons p LEFT JOIN contact t1 on p.p_id=t1.p_id and t1.con_Type='work' LEFT JOIN contact t2 on p.p_id=t2.p_id and t2.con_Type='home' WHERE p.surname like 'stu%' ORDER BY p.surname DESC;
+------+-------------+-----------+---------------------------------------------+-----------------------+----------------+
| p_id | surname | name | company | telhome | telwork |
+------+-------------+-----------+---------------------------------------------+-----------------------+----------------+
| 5520 | Stum### | #eter | ########################################mbH | ################-2901 | NULL |
| 36 | Stuc### | #ar## | #### | ########## 123 | ###########-55 |
| 1603 | Stub######n | #ohn E.G. | ###############ED | ############ 9111 | NULL |
+------+-------------+-----------+---------------------------------------------+-----------------------+----------------+



maybe charset?
there are some surnames with German Ü between this records like surname= Stülmer

show variables like 'char%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | latin1 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+

show variables like 'version';
+---------------+------------------------------+
| Variable_name | Value |
+---------------+------------------------------+
| version | 5.0.22-Debian_1.dotdeb.1-log |
+---------------+------------------------------+





Many thanks
Marcelo



Edited 2 time(s). Last edit at 09/27/2006 12:27AM by Marcelo Stucky.

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Ascending descending Marcelo Stucky 09/26/2006 02:12AM


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