Joining 3+ tables using SQL displaying too many results - mysql

Question

im trying to create a query to join these tables together using this method below. However it is repeating results and they are not linking up correctly. as in the same rating comment would be on about 4/5 different results etc. its producing 18ish results when im expecting 3. would anyone be willing to help me with this problem?
SELECT a.Company_name,
f.Job_ID,
f.Job_Name,
b.User_Name,
c.Comments,
c.Reliability,
c.Rating
FROM company a,
Users b,
Ratings c,
UserCompJobRating d,
Company_Job e,
Jobs f
WHERE d.Comp_job_ID = e.Comp_Job_ID
AND b.users_ID = d.users_ID
AND c.Rating_ID = d.Rating_ID;
Many Thanks,
Andrew
ok i tried this and it is saying e.Users_ID is an unknown column in 'on clause'
SELECT a.Company_name,
b.Job_ID,
b.Job_Name,
c.User_Name,
d.Comments,
d.Reliability,
d.Rating
FROM Company a, UserCompJobRating e, Jobs b
INNER JOIN Users c
ON c.Users_ID = e.Users_ID
inner join Company_Job f
on e.Comp_Job_ID = f.Comp_Job_ID
inner join Ratings d
on d.Rating_ID = e.Rating_ID;
I'm assuming im close, however way off at the same time?
Ill try to give you some more information:
UserCompJobRating has a primary key UCJR_ID and 3 foreign keys of Comp_Job_ID, Users_ID and Rating_ID
Company_Job table as a primary key Comp_Job_ID, and 2 foreign keys Job_ID, Company_ID
Ratings Table has just the Rating_ID as a primary key and the rest just to do with the rating information
Users Table has a Users_ID as a primary key and basic user information address etc etc
Jobs Table has a Job_ID primary key and basic information about the job, such as name, price, etc.
Company Table has Company_ID as a primary key and the basic company information, similar to the Users table.
Here are the definations:
CREATE TABLE `company` (
`Company_ID` int(11) NOT NULL AUTO_INCREMENT,
`Company_Name` varchar(45) NOT NULL,
`CAddress` varchar(45) NOT NULL,
`CTown` varchar(45) NOT NULL,
`CPostcode` varchar(12) NOT NULL,
`CTelephone` varchar(45) NOT NULL,
PRIMARY KEY (`Company_ID`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1
CREATE TABLE `company_job` (
`Comp_Job_ID` int(11) NOT NULL AUTO_INCREMENT,
`Company_ID` int(11) NOT NULL,
`Job_ID` int(11) NOT NULL,
PRIMARY KEY (`Comp_Job_ID`),
KEY `Company_ID_idx` (`Company_ID`),
KEY `Job_ID_idx` (`Job_ID`),
CONSTRAINT `Company_ID` FOREIGN KEY (`Company_ID`) REFERENCES `company` (`Company_ID`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `Job_ID` FOREIGN KEY (`Job_ID`) REFERENCES `jobs` (`Job_ID`) ON DELETE NO ACTION ON UPDATE NO ACTION
CREATE TABLE `jobs` (
`Job_ID` int(11) NOT NULL AUTO_INCREMENT,
`Job_Name` varchar(45) NOT NULL,
`Job_Cost` varchar(45) DEFAULT NULL,
`Job_Avg_Time` varchar(45) DEFAULT NULL,
`Job_Avg_Cost` varchar(45) DEFAULT NULL,
`Job_Description` varchar(45) NOT NULL,
`Company_ID` int(11) NOT NULL,
PRIMARY KEY (`Job_ID`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
CREATE TABLE `ratings` (
`Rating_ID` int(11) NOT NULL AUTO_INCREMENT,
`Comments` varchar(200) DEFAULT NULL,
`Cost` varchar(45) DEFAULT NULL,
`Reliability` varchar(45) DEFAULT NULL,
`Rating` int(11) DEFAULT NULL,
PRIMARY KEY (`Rating_ID`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
CREATE TABLE `usercompjobrating` (
`UCJR_ID` int(11) NOT NULL AUTO_INCREMENT,
`Comp_Job_ID` int(11) DEFAULT NULL,
`Rating_ID` int(11) DEFAULT NULL,
`Users_ID` int(11) DEFAULT NULL,
PRIMARY KEY (`UCJR_ID`),
KEY `Comp_Job_ID_idx` (`Comp_Job_ID`),
KEY `Rating_ID_idx` (`Rating_ID`),
KEY `User_ID_idx` (`Users_ID`),
CONSTRAINT `Comp_Job_ID` FOREIGN KEY (`Comp_Job_ID`) REFERENCES `company_job` (`Comp_Job_ID`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `Rating_ID` FOREIGN KEY (`Rating_ID`) REFERENCES `ratings` (`Rating_ID`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `Users_ID` FOREIGN KEY (`Users_ID`) REFERENCES `users` (`Users_id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
CREATE TABLE `users` (
`Users_id` int(11) NOT NULL AUTO_INCREMENT,
`User_Name` varchar(45) NOT NULL,
`UAddress` varchar(45) NOT NULL,
`UTown` varchar(45) NOT NULL,
`UPostcode` varchar(45) NOT NULL,
`UTelephone` varchar(45) NOT NULL,
`UDOB` varchar(45) NOT NULL,
PRIMARY KEY (`Users_id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1

Answer 1

The query needs to look something like this i.e. use this form
SELECT a.Company_name,
f.Job_ID,
f.Job_Name,
b.User_Name,
c.Comments,
c.Reliability,
c.Rating
FROM company a
INNER JOIN Users b
ON a.???? = b.???
Since I dont have your table definitions I cant help you with the JOIN conditions. Show us the tables definition and we would be able to help.
UPDATE:
So based on your table structures you will be looking for something like this:
SELECT *
FROM company cmp
INNER JOIN company_job cmpjb
ON cmp.Company_ID = cmpjb.Company_ID
INNER JOIN jobs jb
ON cmpjb.Job_ID = jb.Job_ID
INNER JOIN usercompjobrating ucmpjbr
ON ucmpjbr.Comp_Job_ID = ucmpjbr.Comp_Job_ID
INNER JOIN users usr
ON usr.Users_id = ucmpjbr.Users_ID
INNER JOIN ratings rat
ON rat.Rating_ID = ucmpjbr.Rating_ID
Note you cannot use the folder table in this join as there are no primary/foreign key relationships to any of the other tables from the folder table.
I would suggest that you carefully dissect this query and let me know if you need to understand the details.

Answer 2

One thing to clarify, what is company_id in table jobs?
select ... (necessary fields to select)
from company c
join company_job cj using (company_id)
join jobs j using (job_id)
join usercompjobrating ucjr using (comp_job_id)
join ratings using (rating_Id)
join users using (users_id)