MySQL joining with grouping did not join perfectly-CodePudding

I have three table and want to join them but the join returns a single row multiple time when using group by parent id from contact table.

contact table-

id	Name
1	Murad
2	Tajharul

phone table-

id	contact_id	phone
1	1	017
2	2	014
3	2	015

email table-

id	contact_id	email
1	1	[email protected]
2	1	[email protected]
3	1	[email protected]
4	2	[email protected]
5	2	[email protected]

Desired Output-

id	Name	Phone	Email
1	Murad	017	[email protected],[email protected],[email protected]
2	Tajharul	014,015	[email protected],[email protected]

Here is what I have tried so far-

SELECT contact.name , GROUP_CONCAT(phone.phone) phone, GROUP_CONCAT(email.email) email
FROM 
    contact 
    JOIN phone ON contact.id = phone.contact_id
    JOIN email ON contact.id = email.contact_id
GROUP BY contact.id

MySQL Fiddle link: http://sqlfiddle.com/#!9/ded29f/1

CodePudding user response：

Use DISTINCT in group_concat

SELECT contact.name , GROUP_CONCAT(DISTINCT phone.phone) phone, GROUP_CONCAT(DISTINCT email.email) email
FROM 
    contact 
    JOIN phone ON contact.id = phone.contact_id
    JOIN email ON contact.id = email.contact_id
GROUP BY contact.id

CodePudding user response：

You can achieve this by using subquery and Distinct in Group concat:

SELECT T1.id, T1.name, T1.phone, GROUP_CONCAT(DISTINCT email.email) email
FROM 
    (SELECT contact.id, contact.name , GROUP_CONCAT(DISTINCT phone.phone) phone
    FROM 
        contact 
        JOIN phone ON contact.id = phone.contact_id
  GROUP BY contact.id) T1
JOIN email ON T1.id = email.contact_id
GROUP BY T1.id