Inner join with multiple conditions on one column - mysql

Question

I am trying to combine two tables to display.
I have one table (geofence) which holds each region id, name and associated tags. The second table is all routes and prices the user has entered from the available entries in their geofence table.
Table geofence
id
name
tags
52
texas
houston, dallas, austin
53
washington
spokane, seattle
54
oregon
portland, seaside
Table geofence_rates
id
origin_id
destination_id
price
1
52
53
1200
2
53
54
700
3
54
52
900
Desired HTML Output from combining tables
origin id
origin name
origin tags
destination id
destination name
destination tags
price
52
texas
houston, dallas, austin
53
washington
spokane, seattle
1200
53
washington
spokane, seattle
54
oregon
portland, seaside
700
54
oregon
portland, seaside
52
texas
houston, dallas, austin
900
I would like to show all routes, the price and then the associated name and tags for each of the geofence ID's.
My current sql statement gets me the routes and price but will only show the origin name and tags based off the origin id. I am not sure how to also extract the destination name and tags.
SELECT geofence_rates.origin_id, geofence_rates.destination_id,
geofence_rates.price, geofence.id, geofence.name, geofence.tags
FROM geofence_rates
INNER JOIN geofence ON geofence_rates.origin_id = geofence.id
How I can run a single statement and get both the origin and destination name and tags. I understand the bolded portion of my statement is what is causing this, but I am unsure how to create two conditions.

Answer 1

Your current sql statement gets you the routes and price only for the origin because you're matching the two tables on one single condition (the matching origin: geofence_rates.origin_id = geofence.id), yet at same time you're requiring information for destination too.
To solve this, you can apply two JOIN operations:
former to get information on origin
latter to get information on destination
separately.
SELECT orig.id AS origin_id,
orig.name AS origin_name,
orig.tags AS origin_tags,
dest.id AS destination_id,
dest.name AS destination_name,
dest.tags AS destination_tags,
rates.price
FROM geofence_rates rates
INNER JOIN geofence orig
ON rates.origin_id = orig.id
INNER JOIN geofence dest
ON rates.destination_id = dest.id
ORDER BY origin_id
Check the demo here.