Question

I need some serious help. Here’s the thing…
Assume I have a ‘users’ table with fields(userId, name). Now I need to grab multiple items of info from other table relating to this user. Some of the items are similar so need to be bundled together.

Now I also have several other tables:

CREATE TABLE app.phones (
`id` INT NOT NULL AUTO_INCREMENT ,
`userId` INT NOT NULL ,
`phone` VARCHAR( 16 ) NOT NULL ,
PRIMARY KEY ( `id` )
) ENGINE = InnoDB;

CREATE TABLE app.emails (
`id` INT NOT NULL AUTO_INCREMENT ,
`userId` INT NOT NULL ,
`email` VARCHAR( 32 ) NOT NULL ,
PRIMARY KEY ( `id` )
) ENGINE = InnoDB;

CREATE TABLE app.contact_methods (
`id` INT NOT NULL AUTO_INCREMENT ,
`userId` INT NOT NULL ,
`method` ENUM( 'phone', 'email' ) NOT NULL,
`methodId` INT NOT NULL ,
PRIMARY KEY ( `id` )
) ENGINE = InnoDB;

CREATE TABLE app.groups (
`id` INT NOT NULL AUTO_INCREMENT ,
`groupName` VARCHAR( 16 ) NOT NULL ,
PRIMARY KEY ( `id` )
) ENGINE = InnoDB;

CREATE TABLE app.users_groups (
`id` INT NOT NULL AUTO_INCREMENT ,
`userId` INT NOT NULL ,
`groupId` INT NOT NULL ,
PRIMARY KEY ( `id` )
) ENGINE = InnoDB;

As you might guess, each user can have multiple emails, phones and be part of multiple groups. How would I display a table like below using all the tables above?

+---------+-------------+-------------------+--------------+
|name     |phones       |emails             |groups        |
+---------+-------------+-------------------+--------------+
|John Doe |123-555-0101,|[e-mail],  |group1,group2,|
|         |123-555-0909 |[e-mail]  |group3        |
+---------+-------------+---------+---------+--------------+

UPDATE: Emails and Phones should not be taken immediately from their tables. The table contact_methods contains entries which reference those tables.

Answer 1

Try this for size

SELECT u.name, ph.phone, em.email, gr.groupName 
FROM users AS u, phones AS ph, emails AS em, groups AS gr 
WHERE (u.id = ph.userId) 
    AND (u.id = em.userId) 
    AND (u.id = gr.userId) 
GROUP BY u.id

Or to concatenate the values to get one row (thanks @chris-morgan):

SELECT u.name, 
    GROUP_CONCAT(ph.phone SEPARATOR ','), 
    GROUP_CONCAT(em.email SEPARATOR ','), 
    GROUP_CONCAT(gr.groupName SEPARATOR ',') 
FROM users AS u, phones AS ph, emails AS em, groups AS gr 
WHERE (u.id = ph.userId) 
    AND (u.id = em.userId) 
    AND (u.id = gr.userId) 
GROUP BY u.id