?
Solved

MySQL many to many query

Posted on 2011-02-12
1
Medium Priority
?
384 Views
Last Modified: 2012-05-11
Hi I have the following tables:

-- phpMyAdmin SQL Dump
-- version 3.2.0.1
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Feb 09, 2011 at 08:20 PM
-- Server version: 5.1.36
-- PHP Version: 5.3.0

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";

--
-- Database: `test`
--

-- --------------------------------------------------------

--
-- Table structure for table `c`
--

CREATE TABLE IF NOT EXISTS `c` (
  `category_id` int(11) NOT NULL,
  `category_name` varchar(100) COLLATE latin1_german2_ci NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_german2_ci;

--
-- Dumping data for table `c`
--

INSERT INTO `c` (`category_id`, `category_name`) VALUES
(1, 'cat-1'),
(2, 'cat-2'),
(3, 'cat-3'),
(4, 'cat-4');

-- --------------------------------------------------------

--
-- Table structure for table `projects`
--

CREATE TABLE IF NOT EXISTS `projects` (
  `project_id` int(11) NOT NULL AUTO_INCREMENT,
  `project_name` varchar(100) COLLATE latin1_german2_ci NOT NULL,
  `thumb` varchar(100) COLLATE latin1_german2_ci NOT NULL,
  `project_visibility` tinyint(1) DEFAULT NULL,
  PRIMARY KEY (`project_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 COLLATE=latin1_german2_ci AUTO_INCREMENT=4 ;

--
-- Dumping data for table `projects`
--

INSERT INTO `projects` (`project_id`, `project_name`, `thumb`, `project_visibility`) VALUES
(1, 'a', 'a-thumb', 1),
(2, 'b', 'b-thumb', 0),
(3, 'c', 'c-thumb', 1);

-- --------------------------------------------------------

--
-- Table structure for table `p_c`
--

CREATE TABLE IF NOT EXISTS `p_c` (
  `project_id` int(11) NOT NULL,
  `category_id` int(11) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_german2_ci;

--
-- Dumping data for table `p_c`
--

INSERT INTO `p_c` (`project_id`, `category_id`) VALUES
(1, 3),
(1, 4),
(2, 1),
(2, 4),
(3, 2);

Open in new window



I currently have this query:
SELECT * FROM projects WHERE project_name = %s

Open in new window

which displays a project row based on the project_name passed via url variable.

I however would also like to return the category_names which this project belongs to and other project_names that have project_visibility set to "1" and  match this projects category_names


0
Comment
Question by:sany101
1 Comment
 
LVL 41

Accepted Solution

by:
Sharath earned 2000 total points
ID: 34880677
SELECT c.category_name, 
       p.project_name 
  FROM projects AS p 
       JOIN p_c AS pc 
         ON p.project_id = pc.project_id 
       JOIN c 
         ON pc.category_id = c.category_id 
 WHERE p.project_name = %s 
       AND p.project_visibility = 1

Open in new window

0

Featured Post

Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article shows the steps required to install WordPress on Azure. Web Apps, Mobile Apps, API Apps, or Functions, in Azure all these run in an App Service plan. WordPress is no exception and requires an App Service Plan and Database to install
This holiday season, we’re giving away the gift of knowledge—tech knowledge, that is. Keep reading to see what hacks, tips, and trends we have wrapped and waiting for you under the tree.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

593 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question