pouët.net

can someone explain to me why wont the fucking row constructors fucking work on fucking mysql fucking 4.0.20?

i'll be more specific:

mysql> select id from comments where (505,1) in (select which,rating from comments where who=177);

ERROR 1064: You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near '1) in (select which,rating from comments where who=177)' at line 1

and yes i did try to put "row(" instead of "(" and yes i did try the "=" instead of "in", and the ' on the damn fields. they all give same mistake.
and yes i did read the fucking manual.
http://dev.mysql.com/doc/mysql/en/Row_subqueries.html

and before you ask:
mysql> status
mysql Ver 12.22 Distrib 4.0.20, for pc-linux (i686)

anyone knows why this damn simple query doesnt work?
20 glops for right answer -10 for trolling

so you absolutely want to use some mysql make-a-list-from-several-fields-trick with a subquery instead of oldschool stuff like joins:
select a.id from comments a left outer join comments b on (b.which=505, b.rating=1)?
(this is a pretty mindless query but the example looks equivalent.. unless i goofed with leftright or mysql barfs for not referring to a or something)

at this point i'd say kill the glöp, since i have only access to maxdb, postgres and oracle right now (and wont bother installing stuff), but i decided to google:

"Starting with MySQL 4.1, all subquery forms and operations that the SQL standard requires are supported, as well as a few features that are MySQL-specific.
With earlier MySQL versions, it was necessary to work around or avoid the use of subqueries, but people starting to write code now will find that subqueries are a very useful part of the MySQL toolkit."

This'd strongly suggest that you might face some problems with 4.0.20...

(btw, rewriting mindless queries to work equally mindlessly at 4am is pretty hard. an expression that attempted something meaningful would more likely have been gotten right. i wonder why the example is so retarded..)

so the question morphs into a "why do they have online manuals for beta and alpha versions instead of the latest released version?"

i guess im doomed to figure out how the joins are supposed to work.

or persuade jeffry to upgrade server to a beta which doesnt seem too likely to happen.

eitherway, thanks jarno

actually the latest released version is 5.0

mysql 5.0? is that true Gargaj, I thought the latest was 4.0.20? Or did you mean PHP? ;-)

My fault.. there was an 5.0 alpha.

ekoli -= 10 glops. :)

now that i'm awake, i can fix the nonsense join:

select $stuff from foo where ($expr1, $expr2) in (select $col1, $col2 from bar where $whatever)
=
select $stuff from foo, bar where $col1=$expr1 and $col2=$expr2 and $whatever group by $primary_key_of_foo, $stuff

(warning: this looks like it might fuck over the optimizer royally if the cartesian product is large and tables are nonrelated.. luckily that's usually not the case, right?)

now it seems 216 can fake not only raytracing :P

oh shit -10 glöps :))))
ps please send them to homeless children fund or something ok ?
-20 glöps

Actually, JOINs are very nice and clean. Why be afraid of them?

SELECT table1.field1, table1.field2, table2.field3
FROM table1
INNER JOIN table2 ON table1.id = table2.foreign_id
WHERE ....

If you want to join the same table, you can JOIN aliased tables, like:

SELECT table1.field1, table1_ALIAS.field2
FROM table1
INNER JOIN table1 AS table1_ALIAS
ON table1.id = table1_ALIAS.something
WHERE ....

JOINS are both optmizer and source code friendly. And I have yet to find a case where you need sub-SELECTs, as long as the database schema is sane, of course.

mostly couz when i was supposed to be learning joins my girlfriend was visiting and i flunked the class and didnt care about databases ever since. yep, thats pretty much it and im not even sorry one damn bit.

but i'll look into it after i'm done with exams which should be this friday if i'm lucky. got something i wanna implement on pouet that needs to use it.