Add items from table 1 and bring in indexed Rows from table 2

Question

I am very new with SQL and I am creating an application that brings the number of hours contracted, well the part that I have doubts in the query is the index of lines...

I need the rows not to repeat the code from table 1 and the items from table 2 disappear.

My code is this:

SELECT tabela1.codigo_tabela2, SUM(tabela1.itens), tabela2.nome, tabela2.codigo
    FROM tabela1, tabela2
    WHERE tabela1.codigo_tabela2 = tabela2.codigo AND tabela1.ativo = b'1' AND tabela1.usuario = x

Well, I hope you can help me... I couldn’t find anything in my research, (it’s very specific).

Answer 1

SELECT 
    tabela2.nome, 
    tabela2.codigo,
    SUM(tabela1.itens)
FROM tabela1, tabela2
WHERE 
    tabela1.codigo_tabela2 = tabela2.codigo AND 
    tabela1.ativo = b'1' AND  
    tabela1.usuario = x
GROUP BY
    tabela2.nome, 
    tabela2.codigo