Hi,
For the first question you can make it in two step :
SELECT MIN(id) FROM names;
SELECT * FROM names WHERE id = min ;
SELECT MAX(id) FROM names;
SELECT * FROM names WHERE id = max ;
Regards,
Jocelyn Fournier
PresencePC
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, April 21, 2002 4:50 AM
Subject: select first or last row
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.
-
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