How do I combine 3 tables in mysql - mysql

Question

I need some help here
I have 3 tables which looked like:
user_base_info
+-------+-----------+------------------+------------------+------------------+------------------+
|user_id| real_name | live_province | live_city | live_area_big | live_area_small |
+-------+-----------+------------------+------------------+------------------+------------------+
| 1 | John | 15000000 | 15300000 | 15310000 | 15310003 |
| 2 | Susan | 42000000 | 42140000 | 42140400 | 42140401 |
| 3 | Andy | 12000000 | 58300000 | 58302000 | 58302004 |
| 4 | Knoxvile | 12000000 | 12100000 | 12110000 | 12110002 |
| 5 | Abraham | 13000000 | 50200000 | 50200000 | 11115007 |
| ... | ........ | ... | ... | ... | ... |
|331508 | Donald | 41000000 | 41010000 | 41011200 | 41011202 |
+-------+-----------+------------------+------------------+------------------+------------------+
borrow_progress
+--------+-----------+------------+------------+-------------+
|user_id | borrow_id | state | remark | create_time |
+--------+-----------+------------+------------+-------------+
| 170 | 236 | 10 | waiting | 24/04/17 |
| 170 | 236 | 22 | proceed | 02/02/17 |
| 170 | 236 | 26 | success | 25/04/17 |
| 170 | 236 | 30 | sent | 05/11/17 |
| 172 | 237 | 40 | completed | 03/07/17 |
| ... | ... | ... | ... | ... |
| 353252 | 24112 | 90 | failed | 30/01/17 |
+--------+-----------+------------+------------+-------------+
area
+------------+---------------------+
|code | name |
+------------+---------------------+
| 11000000 | Jawa Tengah |
| 12000000 | Jawa Barat |
| 13000000 | Jawa Timur |
| 14000000 | Sumatera Utara |
| 15000000 | DKI Jakarta |
| ... | ... |
| 41000000 | Di Yogyakarta |
| 42140000 | Kota Singkawang |
| 58300000 | Kota Depok |
| 12100000 | Bandung |
| 50200000 | Kabupaten Sukoharjo |
| 41010000 | Kabupaten Sleman |
| 15310000 | Cilandak |
| 42140400 | Singkawang Barat |
| 41011200 | Mlati |
| 12110000 | Arjasari |
| 15310003 | Gandaria Selatan |
| 41011202 | Sinduadi |
+------------+---------------------+
I want to select the user in table user_base_info which has state = 90 in table borrow_progress and change the live_province, live_city, live_area_big, live_area_small code with name in table area.
I want the result looks like this:
+-------+-----------+------------------+------------------+------------------+------------------+
|user_id| real_name | live_province | live_city | live_area_big | live_area_small |
+-------+-----------+------------------+------------------+------------------+------------------+
|331508 | Donald | Di Yogyakarta | Kabupaten Sleman | Mlati | Sinduadi |
+-------+-----------+------------------+------------------+------------------+------------------+
I have tried
SELECT
*
FROM
borrow_progress a
INNER JOIN
user_base_info b ON a.user_id = b.user_id
INNER JOIN
area c ON c.code = b.live_city
WHERE
state = 90
But this is not what I want.

Answer 1

You must join 4 copies of the table area to the other 2 tables.
Each copy of area will return the name for each of the 4 columns: live_province, live_city, live_area_big and live_area_small:
select u.user_id, u.real_name,
a1.name live_province,
a2.name live_city,
a3.name live_area_big,
a4.name live_area_small
from user_base_info u
inner join borrow_progress b on b.user_id= u.user_id
inner join area a1 on a1.code = u.live_province
inner join area a2 on a2.code = u.live_city
inner join area a3 on a3.code = u.live_area_big
inner join area a4 on a4.code = u.live_area_small
where b.state = 90
If there is a case that the columns live_province, live_city, live_area_big and live_area_small in the table user_base_info to be null then use left joins instead of inner joins.
See the demo.
Results:
| user_id | real_name | live_province | live_city | live_area_big | live_area_small |
| ------- | --------- | ------------- | ---------------- | ------------- | --------------- |
| 331508 | Donald | Di Yogyakarta | Kabupaten Sleman | Mlati | Sinduadi |

Answer 2

Try this:
SELECT
b.user_id
, b.real_name
, (select c1.name from area c1 where code = a.live_province) "live_province"
, live_city
, (select c2.name from area c2 where code = a.live_area_big) "live_area_big"
, (select c3.name from area c3 where code = a.live_area_big) "live_area_small"
FROM borrow_progress a
INNER JOIN user_base_info b ON a.user_id = b.user_id
INNER JOIN area c ON c.code = b.live_city
WHERE state = 90