php - Mysql查询内连接？

Question

这个查询有什么问题？它说：在 ' 附近使用的语法INNER JOIN cm_competitions ON cm_matches.competition_id = cm_competitions.compet 在这有什么问题？

$query_matches = "SELECT cm_matches.match_id, cm_competitions.name 
                   INNER JOIN cm_competitions.name 
                   ON cm_matches.competition_id = cm_competitions.competition_id 
                    FROM cm_matches 
                    WHERE cm_matches.club_h_id = 8 
                   OR cm_matches.club_v_id = 8";

Answer 1

你放在FROM cm_matchesafter INNER JOINwhich 应该是 before INNER JOIN。所以试试这个查询：

SELECT cm_matches.match_id, cm_competitions.name 
  FROM cm_matches
 INNER JOIN cm_competitions 
    ON cm_matches.competition_id = cm_competitions.competition_id
 WHERE cm_matches.club_h_id = 8 
    OR cm_matches.club_v_id = 8

Answer 2

在FROM标记后使用INNER JOIN ：

$query_matches = "SELECT cm_matches.match_id, cm_competitions.name  
                  FROM cm_matches 
                  INNER JOIN cm_competitions 
                  ON cm_matches.competition_id = cm_competitions.competition_id
                  WHERE cm_matches.club_h_id = 8 
                  OR cm_matches.club_v_id = 8";

Answer 3

尝试 ：

$query_matches = "SELECT cm_matches.match_id, cm_competitions.name FROM cm_matches INNER JOIN cm_competitions ON cm_matches.competition_id = cm_competitions.competition_id  WHERE cm_matches.club_h_id = 8 OR cm_matches.club_v_id = 8";

Answer 4

您的查询应该是这样的：

$query_matches = "SELECT cm_matches.match_id, cm_competitions.name FROM cm_matches INNER JOIN cm_competitions ON cm_matches.competition_id = cm_competitions.competition_id WHERE cm_matches.club_h_id = 8 OR cm_matches.club_v_id = 8";