Concat分組記錄

Question

我有兩個相關的表，項目ID「projects」和「projects_formats」。

我需要一個查詢，可以提供我的項目，併爲每一行我想連接這種項目所需的格式集。

現在，我的查詢是：

SELECT SQL_CALC_FOUND_ROWS 
     f.*, 
     CONCAT(f.formatID, ', ') as formats 
FROM projects as p INNER JOIN project_formats as f ON f.projectID=p.ID 
WHERE p.ended=0 
GROUP BY f.projectID 

這可能嗎？

Answer 1

相反的CONCAT，嘗試GROUP_CONCAT：

SELECT SQL_CALC_FOUND_ROWS 
     f.*, 
     GROUP_CONCAT(f.formatID SEPARATOR ', ') as formats 
FROM projects as p INNER JOIN project_formats as f ON f.projectID=p.ID 
WHERE p.ended=0 
GROUP BY f.projectID