How to properly write a query to use two copies of a single table? [duplicate] - sql

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How do you join on the same table, twice, in mysql?
(3 answers)
Closed 3 years ago.
I need to show one attribute referring to two different instances of the same attribute.
I have a set of tables such as Branch, Address, Property_for_rent, State. I need to show properties data including the branch_state and the property_state. These two attributes come from the table state row name. My problem is that I haven't found a way to join the table state two times referring to two different instances. I already tried Full Join but sql doesn't recognize one copy of my table state, Union doesn't work because if I split the query into to I won't have the same amount of columns.
need to join this two queries:
SELECT p.property_no, p.prop_type, p.rooms, p.rent, s.name AS property_state, staff_no
FROM state s
JOIN address a ON s.state_id = a.state_id
JOIN property_for_rent p ON a.address_id = p.address_id
ORDER BY rent ASC;
+-------------+-----------+-------+------+----------------+----------+
| property_no | prop_type | rooms | rent | property_state | staff_no |
+-------------+-----------+-------+------+----------------+----------+
| PR200 | Flat | 3 | 24 | Nevada | SQ523 |
| PR901 | Flat | 7 | 31 | Vermont | SL569 |
| PR806 | House | 3 | 54 | Minnesota | NULL |
SELECT branch_no, z.name AS branch_state
FROM branch b
JOIN address a ON b.address_id = a.address_id
JOIN state z ON a.state_id = z.state_id;
+-----------+----------------+
| branch_no | branch_state |
+-----------+----------------+
| B424 | Kentucky |
| B947 | Massachusetts |
| B942 | South Carolina |
| B714 | North Dakota |
branch_state and property_state are alias for the name attribute in the state table.

Answer 1

You need to connect the branch to the property somehow. Let me assume that property_for_rent has a column for branch_id:
SELECT p.property_no, p.prop_type, p.rooms, p.rent,
sp.name AS property_state, staff_no,
sb.name as branch_state
FROM property_for_rent p JOIN
address ap
ON ap.address_id = p.address_id JOIN
state sp
ON sp.state_id = ap.state_id JOIN
branch b
on p.branch_id = b.branch_id JOIN
address ab
ON ab.address_id = b.address_id JOIN
state sb
ON sb.state_id = ab.state_id
ORDER BY rent ASC;