Hi
MySql Details ---- My server is running MySQL 3.23.45 and I have
4.0.0-alpha-nt on my local test machine.
What is the fastest way to select the first or the last row from a database?
I have tried queries like this
(id is an auto incrementing primary key)
select * from names order by id desc limit 1
select * from names order by id asc limit 1
select * from names limit 1
if I run the following sql queries with the explain command it returns the
following results
****************
table type possible_keys key key_len ref rows Extra
----- ---- ------------- --- ------- --- ---- -----
names index NULL PRIMARY 4 NULL 61368
*************
No matter what I do, and what indexes I use, I cannot seem to find a way of
selecting the last or first row without scanning the whole table.
A few times recently I've wished for a new table type, a table that acts
more like a pipe or stack just to solve this problem.
Thanks
Pete Kelly
Other Items on my MySql wish list.
1 . It would also be nice to combine a select and a delete command together
to form a whole new command, (Retrive data and auto delete the row)
2 . Another new command I would like to see is "Show Processlist History",
basically this would show the last 30 or so queries run on the server.
3. I often run queries like this
SELECT id FROM users WHERE name = 'pete'
if the row exists
UPDATE users SET visits=visits+1 WHERE name = 'pete'
else
INSERT INTO users (name) VALUES ('pete')
It would be nice to make this type of code quicker.
---------------------------------------------------------------------
Before posting, please check:
http://www.mysql.com/manual.php (the manual)
http://lists.mysql.com/ (the list archive)
To request this thread, e-mail <[EMAIL PROTECTED]>
To unsubscribe, e-mail <[EMAIL PROTECTED]>
Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
