如何显示2个访问表中的所有记录

Question

我一直致力于管理当地高中橄榄球联盟的访问项目......

我有2张桌子： tbl_schools，包含字段：

[id_school, school_name]

和 tbl_penalties，包含字段：

[id_penalty, school, player, match, card]

和查询，query_penalties：

SELECT DISTINCTROW tbl_penalties.school, Count(tbl_penalties.school) AS penalties
FROM tbl_penalties
GROUP BY tbl_penalties.school;

任务/我的问题： 我需要一个查询来显示（在它的第一列）tbl_schools中的所有学校和（在它的第二列）学校受到惩罚的次数，如果学校没有受到任何惩罚，则需要0 ...

Answer 1

SELECT S.school_name
      ,COUNT(P.school) AS penalties
FROM tbl_schools S  LEFT JOIN tbl_penalties P
ON S.id_school = P.school
GROUP BY S.school_name