listing corresponding data of two tables - mysql

Question

i'm pretty new to sql and i have a problem that i coundn't really describe to google
SELECT name AS state
FROM state
WHERE id IN
(
SELECT state_id
FROM city
WHERE id=(SELECT city_id FROM zipcode)
)
;
This lists the states of all zipcodes I have in my database, I also want to list the zipcodes (zipcode.zipcode) in a additional column corresponding with the state
Thank you very much in advance for your help
my tables look like this:
city
+----+----------+-----------+---------------------+---------+---------+
| id | state_id | county_id | name | lat | lng |
+----+----------+-----------+---------------------+---------+---------+
| 1 | 1 | 1 | Prem, Oberbayern | 47.6833 | 10.8 |
| 2 | 2 | 2 | Pfullendorf (Baden) | 47.9249 | 9.25718 |
| 3 | 3 | 3 | Wissen, Sieg | 50.7833 | 7.75 |
| 4 | 1 | 4 | Miltenberg | 49.7039 | 9.26444 |
| 5 | 1 | 5 | Moosthenning | 48.6833 | 12.5 |
| 6 | 1 | 1 | Bernbeuren | 47.7333 | 10.7833 |
| 7 | 4 | 6 | Demmin, Hansestadt | 53.9 | 13.0333 |
| 8 | 2 | 7 | Konstanz, Universit | 47.6667 | 9.18333 |
| 9 | 5 | 8 | Teutschenthal | 51.45 | 11.8 |
| 10 | 6 | 9 | Vierlinden | 52.515 | 14.3141 |
+----+----------+-----------+---------------------+---------+---------+
zipcode
+----+---------+-------------+---------+
| id | city_id | district_id | zipcode |
+----+---------+-------------+---------+
| 1 | 1 | NULL | 86984 |
| 2 | 2 | NULL | 88630 |
| 3 | 3 | NULL | 57537 |
| 4 | 4 | NULL | 63897 |
| 5 | 4312 | 502 | 84164 |
| 6 | 6 | NULL | 86975 |
| 7 | 7 | 778 | 17109 |
| 8 | 8 | NULL | 78462 |
| 9 | 8 | NULL | 78464 |
| 10 | 8 | NULL | 78465 |
+----+---------+-------------+---------+
state
+----+------------------------+
| id | name |
+----+------------------------+
| 1 | Bayern |
| 2 | Baden-W?rttemberg |
| 3 | Rheinland-Pfalz |
| 4 | Mecklenburg-Vorpommern |
| 5 | Sachsen-Anhalt |
| 6 | Brandenburg |
| 7 | Niedersachsen |
| 8 | Schleswig-Holstein |
| 9 | Nordrhein-Westfalen |
| 10 | Th?ringen |
+----+------------------------+

Answer 1

Use explicit JOINs:
SELECT z.*, s.name AS state
FROM zipcode z JOIN
city c
ON z.city_id = c.id JOIN
state s
ON c.state_id = s.id;
If you are learning SQL, focus on learning JOIN rather than IN.