Question

these are my tables:

TABLE ‘USERS’

ID      NAME     AGE 
01      John     22
02      Gloria   27

TABLE ‘CITIES’

ID    USER_ID    CITY
22    01         Sacramento
23    02         Phoenix

TABLE ‘HOBBIES’

ID     USER_ID   HOBBY
88     01        swimming
89     01        reading
90     02        reading

Okay, so we have two fellas: John is from Sacramento and likes swimming and reading.
Gloria is from Phoenix and only likes reading.

I know how to join the first two tables:

SELECT * FROM users INNER JOIN cities ON users.id = cities.user_id

But how can I join the ‘hobbies’ table and only display users who like swimming?

Thanks a lot,
Matthias

Answer 1

You will just add a JOIN to the last table and add a WHERE clause

SELECT * 
FROM users  
INNER JOIN cities  
    ON users.id = cities.user_id
INNER JOIN hobbies
    ON users.id = hobbies.USER_ID
WHERE Hobbies.Hobby = 'swimming'