SQL search user and user state from city_id [closed] - php

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I don't know if the title makes any sense, but here is the situation: See 4 tables below
User Table(There is 200 + user)
+-------+---------+-------------------+---------+
|iduser | user | address | idcity |
+-------+---------+-------------------+---------+
| 1 | person1 | some address | 123 |
| 2 | person2 | another address | 542 |
| 3 | person3 | different address | 623 |
+-------+---------+-------------------+---------+
City Table
+---------+-------+----------+
| idcity | city | idstate |
+---------+-------+----------+
| 123 | city1 | 1 |
| 542 | city2 | 2 |
| 623 | city3 | 3 |
+---------+-------+----------+
State Table
+---------+--------+------------+
| idstate | state | idcountry |
+---------+--------+------------+
| 1 | state1 | 4 |
| 2 | state2 | 5 |
| 3 | state3 | 6 |
+---------+--------+------------+
Country Table
+-----------+----------+
| idcountry | country |
+-----------+----------+
| 4 | country1 |
| 5 | country2 |
| 6 | country3 |
+-----------+----------+
NOTE = I need to find out all people that belong to State and search by idcity
Output
+--------+----------+-------------------+---------+---------+
| iduser | user | address | idcity | state |
+--------+----------+-------------------+---------+---------+
| 11 | person11 | some address | 123 | state1 |
| 2 | person2 | another address | 123 | state1 |
| 13 | person13 | different address | 123 | state1 |
+--------+----------+-------------------+---------+---------+
or
+--------+----------+-------------------+---------+---------+
| iduser | user | address | idcity | state |
+--------+----------+-------------------+---------+---------+
| 20 | person20 | some address | 542 | state3 |
| 12 | person12 | another address | 542 | state3 |
| 33 | person33 | different address | 542 | state3 |
+--------+----------+-------------------+---------+---------+
How to achieve this with a single JOIN?I tried combining the two table within a JOIN(in query) which doesn't feel right somehow. Please Help how can i fix this pblm. Thankyou

Answer 1

Try like this,
select u.iduser,u.user,u.address,u.idcity,s.state
From usertable u
inner join city c on c.idcity=u.idcity
inner join state s on s.idstate=c.idstate

Answer 2

To get the city id
select
c.idcity
from city c
where c.idcity = <someidcity>
To join state name
select
c.idcity,
s.state
from city c
join state s on s.idstate = c.idstate
where c.idcity = <someidcity>
Then to join user
select
u.iduser,
u.user,
u.address,
c.idcity,
s.state
from city c
join state s on s.idstate = c.idstate
join user u on u.idcity = c.idcity
where c.idcity = <someidcity>
You can't do that in a single join, as you wanna infos (other than ids) from table user and table state, which have no direct relationship.

Answer 3

Try this
SELECT
a.iduser,
a.user,
a.address,
b.idcity,
c.state
FROM
users a
INNER JOIN
cities b
ON
a.idcity=b.idcity
INNER JOIN
states c
ON
b.idstate=c.idstate
WHERE
c.state='myState'
AND b.city='myCity'