連接MySql結果

Question

我有這個查詢，它將搜索一些新聞，並返回新聞數據作爲其組，公司和類別。事情是一個新聞可以有很多公司和組，我需要將這個結果（grupoNome和empresaNome）在每個字段中連接起來，因此使得這個查詢只返回一行：

這是我的'普通'查詢結果：

id titulo categoriaId url  categoriaNome  grupoNome empresaNome 
5 Teste 1   teste "Todas as Notícas" "Group 1" Company 1 
5 Teste 1   teste "Todas as Notícas" "Group 1" Company 2 
5 Teste 1   teste "Todas as Notícas" "Group 1" Company 3 
5 Teste 1   teste "Todas as Notícas" "Group 1" Company 4 
5 Teste 1   teste "Todas as Notícas" "Group 2" Company 1 
5 Teste 1   teste "Todas as Notícas" "Group 2" Company 2 
5 Teste 1   teste "Todas as Notícas" "Group 2" Company 3 
5 Teste 1   teste "Todas as Notícas" "Group 2" Company 4 
5 Teste 1   teste "Todas as Notícas" "Group 3" Company 1 
5 Teste 1   teste "Todas as Notícas" "Group 3" Company 2 
5 Teste 1   teste "Todas as Notícas" "Group 3" Company 3 
5 Teste 1   teste "Todas as Notícas" "Group 3" Company 4 

這是我的查詢：

SELECT n.*, nc.nome AS categoriaNome, g.nome AS grupoNome, e.nome AS empresaNome FROM `noticias` n 
INNER JOIN `noticiascategorias` nc ON n.categoriaId = nc.id 
INNER JOIN `noticiasgrupos` ng ON n.id = ng.noticiaId 
INNER JOIN `grupos` g ON g.id = ng.grupoId 
INNER JOIN `noticiasempresas` ne ON n.id = ne.noticiaId 
INNER JOIN `empresas` e ON e.id = ne.empresaId 
WHERE n.url LIKE 'teste'; 

noticiasgrupos/noticiasempresas包含新聞集團/公司多對多relantionship。

grupos/empresas包含組/公司信息。

編輯：

我會需要的結果是這樣的：

5 Teste 1 teste "Todas as Notícas" "Group 1_Group2_Group_3" "Company 1_Company_Company_3" 

除數可以是任何東西，我以後可以用它來分割（| _ *）

Answer 1

您可以使用GROUP_CONCAT來做到這一點。只需將您的GROUP BY設置爲您想要分組的任何內容即可。您也可以爲GROUP_CONCAT指定排序順序和分隔符。

SELECT n.*, nc.nome AS categoriaNome, 
     GROUP_CONCAT(DISTINCT g.nome ORDER BY g.nome ASC SEPARATOR '_') AS grupoNome, 
     GROUP_CONCAT(DISTINCT e.nome ORDER BY g.nome ASC SEPARATOR '_') AS EmpresaNome 
FROM `noticias` n 
INNER JOIN `noticiascategorias` nc ON n.categoriaId = nc.id 
INNER JOIN `noticiasgrupos` ng ON n.id = ng.noticiaId 
INNER JOIN `grupos` g ON g.id = ng.grupoId 
INNER JOIN `noticiasempresas` ne ON n.id = ne.noticiaId 
INNER JOIN `empresas` e ON e.id = ne.empresaId 
WHERE n.url LIKE 'teste' 
GROUP BY n.id;