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在此查詢中,DISTINCT關鍵字不起作用。從主題表顯示重複的主題..有誰可以告訴我我犯了什麼錯誤嗎?DISTINCT關鍵字在我的查詢中不起作用
SELECT DISTINCT
tutor_category_subject.subject_id,
GROUP_CONCAT(subject.subjects SEPARATOR ', ') AS subjects
FROM tutor_category_subject
INNER JOIN subject ON tutor_category_subject.subject_id = subject.subject_id
WHERE tutor_category_subject.tutor_id = 3;
閱讀這個答案http://stackoverflow.com/questions/8203969/unexpected-sql-query-behavior-distinct/8203983#8203983 – 2012-07-22 10:33:40
您的查詢有語法錯誤。請糾正它們。 – 2012-07-22 10:36:18
我更新了我的查詢 – ugnuku 2012-07-22 10:39:58