Thread: Two-table query
View Single Post
  #1  
Old 02-19-2005, 12:44 AM
filburt1 filburt1 is offline
 
Join Date: Feb 2002
Location: Maryland, US
Posts: 6,144
Благодарил(а): 0 раз(а)
Поблагодарили: 0 раз(а) в 0 сообщениях
Default Two-table query

I have a table called (for example) "votes" with the following structure:

"userid:" INT(10) UNSIGNED NOT NULL DEFAULT 0
"entryid:" INT(10) UNSIGNED NOT NULL DEFAULT 0

...with a unique grouping on those two columns.

It is related to another table I have called "entries" with the following general structure:

"entryid:" same as "votes"'s entryid column (the two tables relate to each other through this column)
"year": YEAR DEFAULT 1970
"month": INT(2) UNSIGNED DEFAULT 1
column4
column5
.
.
.

...plus some additional columns in "entries."

For each unique year/month combination, how can I find out which entry got the most number of votes?

For example, I believe this query gets the entryid and the associated entry data that has the most votes in the "votes" table for February 2005:
[sql]
SELECT v.entryid, COUNT(v.userid) AS votecount, e.column4, e.column5... FROM votes v, entries e WHERE v.entryid = e.entryid AND e.month = 2 AND e.year = 2005 ORDER BY votecount DESC LIMIT 1
[/sql]
Without querying in a loop, how can I extend the query so that it gets the winning entry for each month and year (i.e., the winner for February 2005, March 2005, etc.) instead of just one given month? I do not know how to do this given MySQL does not let you give ORDER BY power over GROUP BY.
Reply With Quote
 
X vBulletin 3.8.12 by vBS Debug Information
  • Page Generation 0.01214 seconds
  • Memory Usage 1,764KB
  • Queries Executed 11 (?)
More Information
Template Usage:
  • (1)SHOWTHREAD_SHOWPOST
  • (1)ad_footer_end
  • (1)ad_footer_start
  • (1)ad_header_end
  • (1)ad_header_logo
  • (1)ad_navbar_below
  • (1)footer
  • (1)gobutton
  • (1)header
  • (1)headinclude
  • (6)option
  • (1)post_thanks_box
  • (1)post_thanks_button
  • (1)post_thanks_javascript
  • (1)post_thanks_navbar_search
  • (1)post_thanks_postbit_info
  • (1)postbit
  • (1)postbit_onlinestatus
  • (1)postbit_wrapper
  • (1)spacer_close
  • (1)spacer_open 

Phrase Groups Available:
  • global
  • postbit
  • reputationlevel
  • showthread
Included Files:
  • ./showpost.php
  • ./global.php
  • ./includes/init.php
  • ./includes/class_core.php
  • ./includes/config.php
  • ./includes/functions.php
  • ./includes/class_hook.php
  • ./includes/modsystem_functions.php
  • ./includes/functions_bigthree.php
  • ./includes/class_postbit.php
  • ./includes/class_bbcode.php
  • ./includes/functions_reputation.php
  • ./includes/functions_post_thanks.php 

Hooks Called:
  • init_startup
  • init_startup_session_setup_start
  • init_startup_session_setup_complete
  • cache_permissions
  • fetch_postinfo_query
  • fetch_postinfo
  • fetch_threadinfo_query
  • fetch_threadinfo
  • fetch_foruminfo
  • style_fetch
  • cache_templates
  • global_start
  • parse_templates
  • global_setup_complete
  • showpost_start
  • bbcode_fetch_tags
  • bbcode_create
  • postbit_factory
  • showpost_post
  • postbit_display_start
  • post_thanks_function_post_thanks_off_start
  • post_thanks_function_post_thanks_off_end
  • post_thanks_function_fetch_thanks_start
  • post_thanks_function_fetch_thanks_end
  • post_thanks_function_thanked_already_start
  • post_thanks_function_thanked_already_end
  • fetch_musername
  • postbit_imicons
  • bbcode_parse_start
  • bbcode_parse_complete_precache
  • bbcode_parse_complete
  • postbit_display_complete
  • post_thanks_function_can_thank_this_post_start
  • showpost_complete