JOIN Query In MYSQL and PHP - php

Question

I am going to generate specific information from all the tables in MYSQL. I have 5 tables in my database. I.e.:
advertiser
CREATE TABLE `advertiser` (
`Adv_id` int(11) NOT NULL AUTO_INCREMENT,
`Name` char(20) NOT NULL,
`F_Name` char(20) NOT NULL,
`Address` varchar(40) NOT NULL,
`CNIC` int(13) NOT NULL,
`Contact` int(11) NOT NULL,
`Monthly_fee` varchar(10) NOT NULL,
`Region` varchar(10) NOT NULL,
`Reg_date` varchar(10) NOT NULL,
PRIMARY KEY (`Adv_id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1;
company_information
CREATE TABLE `company_information` (
`Company_id` int(11) NOT NULL AUTO_INCREMENT,
`Company_Name` varchar(20) NOT NULL,
`Company_Contact` int(11) NOT NULL,
`Company_Address` varchar(30) NOT NULL,
PRIMARY KEY (`Company_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
advertisement
CREATE TABLE `advertisement` (
`Ads_id` int(11) NOT NULL AUTO_INCREMENT,
`Adv_id_id` int(11) NOT NULL,
`Company_id` int(11) NOT NULL,
`Ads_Title` varchar(20) NOT NULL,
`Ads_Description` varchar(40) NOT NULL,
`Ads_Image` varchar(50) NOT NULL,
PRIMARY KEY (`Ads_id`),
KEY `Adv_id` (`Adv_id_id`),
KEY `Company_id` (`Company_id`),
CONSTRAINT `Adv_id` FOREIGN KEY (`Adv_id_id`) REFERENCES `advertiser` (`Adv_id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `advertisement_ibfk_1` FOREIGN KEY (`Company_id`) REFERENCES `company_information` (`Company_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1;
ads_type
CREATE TABLE `ads_type` (
`Ads_type_id` int(11) NOT NULL AUTO_INCREMENT,
`Advertisement_id` int(11) NOT NULL,
`Full_Channel_Ads` varchar(30) NOT NULL,
`Logo_Ads` varchar(30) NOT NULL,
`Com_Break_Ads` varchar(30) NOT NULL,
PRIMARY KEY (`Ads_type_id`),
KEY `Advertisement_id` (`Advertisement_id`),
CONSTRAINT `Advertisement_id` FOREIGN KEY (`Advertisement_id`) REFERENCES `advertisement` (`Ads_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
ads_date
CREATE TABLE `ads_date` (
`Ads_date_id` int(11) NOT NULL AUTO_INCREMENT,
`Ads_id` int(11) NOT NULL,
`Starting_Date` varchar(30) NOT NULL,
`Expiry_Date` varchar(30) NOT NULL,
PRIMARY KEY (`Ads_date_id`),
KEY `Ads_id` (`Ads_id`),
CONSTRAINT `Ads_id` FOREIGN KEY (`Ads_id`) REFERENCES `advertisement` (`Ads_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
I want to retrive
Name, CNIN, and Contact from table Advertiser
Company_Name from company_information
Ads_Title from Advertisement
Starting_Date and Expiry_Date From ads_date.
This Query work well for the above rows :
SELECT *
FROM ads_date a
JOIN advertisement ci ON ci.Ads_id = a.Ads_id
JOIN company_information ar ON ar.Company_id = ci.Company_id
JOIN advertiser ad ON ad.Adv_id = ci.Advertiser_id
WHERE Expiry_Date >= CURDATE()
Problem:
I also want to retrive Advertisement_type from ads_type.
how can I do this with a JOIN query? Can any one explain?

Answer 1

You'll need another join:
SELECT *
FROM ads_date a
JOIN advertisement ci ON ci.Ads_id = a.Ads_id
JOIN company_information ar ON ar.Company_id = ci.Company_id
JOIN advertiser ad ON ad.Adv_id = ci.Advertiser_id
JOIN ads_type at ON at.Advertisement_id = ci.Ads_id -- Here
WHERE Expiry_Date >= CURDATE()

Answer 2

Please try the below query:
SELECT *
FROM ads_date a
JOIN advertisement ci ON ci.Ads_id = a.Ads_id
JOIN company_information ar ON ar.Company_id = ci.Company_id
JOIN advertiser ad ON ad.Adv_id = ci.Advertiser_id
JOIN ads_type at ON at.Advertisement_id =ci.Ads_id
WHERE Expiry_Date >= CURDATE()

Answer 3

Add another join as
JOIN ads_type at ON at.Advertisement_id = ci.Ads_id
Then use group_by at.Advertisement_id to avoid repetition.