MySQL query displaying more data than expected - mysql

Question

I have MySql database connected to my Java app. My users can choose meals, category of meals, quantity, write note and order that meals. I store that orders in table usluga_hrana. At the moment I am working only with meals service but I have other services too, like drink service, wake up service and others. Thats why I need one more table for all orders from different services and its called narudzba. Now I need to display values of all these atributes in one query: broj_sobe (room number, table narudzba), id_narudzba (id order, table narudzba), naziv_kategorija (category name, table kategorija_jela), naziv_hrane (name of meal, table naziv_jela), kolicina (quantity, table usluga_hrana), napomena (note, table usluga_hrana), datum_vrijeme (date and time, table usluga_hrana) and izvrseno (done, table narudzba). Problem is that all these atributes are in different tables and when I execute my query, it displays me multiple values of orders, meals etc.
My tables are connected this way:
PK id_usluga (table usluga) is FK id_usluga in table narudzba
PK id_usluga (table usluga) is FK id_usluga in table usluga_hrana
PK id_kategorija (table kategorija_jela) is FK id_kategorija in table usluga_hrana
PK id_hrana (table naziv_jela) is FK id_hrana in table usluga_hrana
PK id_kategorija (table kategorija_jela) is FK id_kategorija in table naziv_jela
Here is album of my tables and result of my query with multiple values: http://imgur.com/a/6grPN
Here is album with rest of my tables: http://imgur.com/a/sFPie
Here is my query:
SELECT n.broj_soba, n.id_narudzba, kj.naziv_kategorija, nj.naziv_hrane, us.kolicina,
us.napomena, us.datum_vrijeme, n.izvrseno
FROM narudzba n
JOIN usluga u ON n.id_usluga = u.id_usluga
JOIN usluga_hrana us ON u.id_usluga = us.id_usluga
JOIN naziv_jela nj ON us.id_jela = nj.id_jela
JOIN kategorija_jela kj ON nj.id_kategorija = kj.id_kategorija
GROUP BY n.id_narudzba, us.id_usluga_hrana
I think my query is not good...

Answer 1

you name your table in not-English make us very hard to read/understand/think even though you already translate it to English :)
Your duplicate data can come from your query or your data table
I can see in your usluga_hrana table you have to records of Tomato soup (id=10) with different quantity (4 and 7). That make your query result 2 line of Tomato soup. Another example, You have 4 records of Greek Salad also but because 3 of them get the same quantity=1 so when query run, it return 2 row (quantity 1 and 2)
Not sure what you want, but if you do not want query result duplicate, you should not SELECT the quantity column and do DISTINCT the result if needed