如何内联两个匿名表 [SQL]

Question

as the title states, Let's say i have three tables: person , autos , numbers .

Created

First table with: INNER JOIN of person and autos

Second Table with: INNER JOIN of autos and numbers

Question: Is it possible to INNER JOIN first and second table ?

Answer 1

You can join the two tables based on the autos part. Assuming it has an ID:

SELECT *
FROM   first_table f
JOIN   second_table s ON f.auto_id = s.auto_id

Answer 2

You can do 2 joins (with 3 tables) together. Which are the keys for the joins? personID for person and autos and on numbers

SELECT *
FROM person p
JOIN autos a ON p.keyA= a.keyA
JOIN numbers n ON a.keyB = n.keyB

Where keyA and keyB are the corresponding field on which you want to do the join.