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04.04.2007 at 03:44PM PDT, ID: 22493260
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7.4

MySQL select and count from multiple tables.

Asked by pete420 in MySQL Server

Tags: , , , ,

I have a database structure:
Table: choices
Fields: CID, PID(FK), Choice
Table: voteRecord
Fields: VRID, CID, UID, PID
Table: users
fields: UID, Username
Table: polls
fields: PID, pollQuestion

I wish to select the choice field from choices as well as counting how many times it is in VRID. The closest I have came is:
SELECT choice, count(voteRecord.CID)
FROM choices, voteRecord, users, polls
WHERE choices.PID=2 and voteRecord.UID=users.UID and voteRecord.CID=choices.CID and voteRecord.PID=polls.PID
GROUP BY voteRecord.CID

This provides the answer:
option 1 :: 3
option 2  :: 2
option 3 :: 1
option 4 :: 2

wheras it should be 1:1:1:2 as the number of votes per option.

I want to do this so that even if  for example option one is not selected whenever I go to output the results in java then an empty value is output and it keeps the tables alignd. (this is to be output into tables in a servlet)


Thanks,
PeteStart Free Trial
 
 
[+][-]04.04.2007 at 06:17PM PDT, ID: 18854969

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[+][-]04.05.2007 at 02:47AM PDT, ID: 18856579

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[+][-]04.05.2007 at 12:00PM PDT, ID: 18860189

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About this solution

Zone: MySQL Server
Tags: mysql, multiple, tables, select, from
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Solution Provided By: taveirne
Participating Experts: 2
Solution Grade: A
 
 
[+][-]04.05.2007 at 01:32PM PDT, ID: 18860787

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[+][-]09.02.2008 at 01:50PM PDT, ID: 22371574

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[+][-]09.08.2008 at 04:37PM PDT, ID: 22422585

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