I have a table ('names') which includes data related with other data in other tables relying on ids. For example:
*Names table
id | name | predecessor | successor | house | birthplace
-----------------------------------------------------------------
10 Bayezid II 9 11 4 NULL
11 Selim I 10 12 4 5
12 Suleiman 11 13 4 61
*Houses table
id | house
--------------
4 House of Osman
*Places table
id | place
--------------
5 Amasya
61 Trabzon
What I'm trying to accomplish is to construct a query which results in returning whole information depending on the id, like:
{"result":[{
"id":"11",
"name":"Selim I",
"predecessor": "Bayezid II",
"successor": "Suleiman",
"house":"House of Osman",
"birthplace":"Amasya"
}]}
So, the name of the house and the birthplace are brought from other tables ('houses', 'places') whereas the predecessor and the successor are from the same table. I need help constructing this query. Thank you.
Just self-join a couple times, once to get the predecessor's row (aliased n0 below), and once more for the successor's (n2):
SELECT n1.id, n1.name, n0.name AS predecessor, n2.name AS successor
FROM names n1
LEFT JOIN names n0 ON n1.predecessor = n0.id
LEFT JOIN names n2 ON n1.successor = n2.id
Joining to get the house and birthplace are left as an exercise for the reader.
Try this:
select n.id,
n.name,
n1.name as predecessor,
n2.name as successor,
h.house,
p.place
from names n
inner join names n1 on n.id = n1.predecessor
inner join names n2 on n.id = n2.successor
left join Houses h on n.house = h.id
left join Place p on n.birthplace = p.id
where n.id = 11