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Ajuda com propriedades colunas tabelas


txabeiro
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Bom dia,

Precisava de ajuda aqui num probleminha.
Tenho uma tabela marca_equipamento e outra modelo_equipamento,
ao qual a marca_equipamento tem as colunas mrc_id(primary key),mrc_codigo, mrc_designacao e a tabela
modelo_equipamento tem as colunas mdl_id (primary key),mdl_mrc_id(foreign key),mdl_codigo,mdl_designacao.
Eu tive de associar nova coluna na tabela modelo_equipamento para que apareça numa View (codigo asp.net mvc) a informação da marca.
Para isso precisava da relação mdl_designacao_marca ir retirar dados a coluna mrc_codigo.como posso fazer isso?

select mdl_id,mdl_mrc_id,mdl_codigo,mdl_designacao,mdl_designacao_marca
from modelo_equipamento
inner join marca_equipamento on mdl_mrc_id = mrc_id where mdl_id=13.

retorna mdl_designacao_marca a 0.

podem ajudar?!

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