SQLite compare query from 2 tables - sqlite

Question

I would like to create a new query for know how many product are in the store.
table: tb_store
+--------+------------+------------------+-----------+
| item_id| nome | data_out | data_in |
+--------+------------+------------------+-----------+
| 1 | Produ1 | null | 2015-01-06|
| 2 | Produ1 | null | 2015-01-06|
| 3 | Produ3 | null | 2015-01-06|
| 4 | Produ3 | null | 2015-01-06|
| 5 | Produ5 | null | 2015-01-06|
| 6 | Produ4 | 2015-01-06 | 2015-02-06|
| 7 | Produ2 | 2015-01-06 | 2015-02-06|
+--------+------------+------------------+-----------+
table: tb_product
+--------+------------+
| item_id| nome |
+--------+------------+
| 1 | Produ1 |
| 2 | Produ2 |
| 3 | Produ3 |
| 4 | Produ4 |
| 5 | Produ5 |
+--------+------------+
i have write this query:
select nome, count(nome) as pezzi from tb_store where data_out is null or data_out="" group by nome order by pezzi desc
the result are:
+--------+------------+
| nome | pezzi |
+--------+------------+
| Produ1 | 2 |
| Produ3 | 2 |
| Produ5 | 1 |
+--------+------------+
i would like to obtain this result:
+--------+------------+
| nome | pezzi |
+--------+------------+
| Produ1 | 2 |
| Produ3 | 2 |
| Produ5 | 1 |
| Produ2 | 0 |
| Produ4 | 0 |
+--------+------------+
is possible? how can rewrite the query?
EDIT
I have create a new query like this:
SELECT DISTINCT nome, pezzi FROM(
SELECT nome,COALESCE(pezzi,0)as pezzi FROM(
SELECT p.nome, COUNT(s.nome) as pezzi
FROM tb_product as p LEFT JOIN tb_store as s
ON p.nome = s.nome
WHERE s.data_out is null
OR s.data_out = ""
GROUP BY p.nome
union
select nome,null as pezzi from tb_product) )
ORDER BY pezzi DESC
but i have some duplicate item to remove....the result is
nome pezzi
crema 2
pistacchio 2
zabajone 2
bacio 1
cassata 1
cioccolato 1
ciocco rum 1
malaga 1
mango 1
mascarpone 1
nocciola 1
stracciatella 1
bacio 0
caramello 0
cassata 0
cioccolato 0
ciocco rum 0
crema 0
fragola 0
limone 0
malaga 0
mango 0
mascarpone 0
nocciola 0
pistacchio 0
zabajone 0
is possible to remove the duplicate that are 0?
SELECT DISTINCT nome, pezzi FROM(
SELECT nome,COALESCE(pezzi,0)as pezzi FROM(
SELECT p.nome, COUNT(s.nome) as pezzi
FROM tb_product as p LEFT JOIN tb_store as s
ON p.nome = s.nome
WHERE s.data_out is null
OR s.data_out = ""
GROUP BY p.nome
union
select nome,null as pezzi from tb_product) GROUP BY nome )
ORDER BY pezzi DESC

Answer 1

You need to do a left join between the two tables like:
SELECT p.nome, COUNT(s.nome) as pezzi
FROM tb_product as p LEFT JOIN tb_store as s
ON p.name = s.name
WHERE data_out is null
OR data_out = ""
GROUP BY p.nome
ORDER BY pezzi DESC