JOIN和GROUP_CONCAT

Question

努力讓這個查詢工作：

$query_search = "SELECT questionnaires_index.id, questionnaires_index.ea_num, questionnaires_index.address, questionnaires_index.status, questionnaires_index.json_stored users.username FROM questionnaires_index INNER JOIN users ON questionnaires_index.interviewer_id = users.id WHERE questionnaires_index.interviewer_id IN (SELECT GROUP_CONCAT(id) FROM users WHERE supervisor = (SELECT id FROM users WHERE username = '".$username."'))"; 

收到此錯誤：

Error in query: . You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.username FROM questionnaires_index INNER JOIN users ON users.id = questionnaire' at line 1

查詢是工作，直到我說的users.username到結果與設定JOIN語句。請任何幫助。

Answer 1

你已經錯過了一個逗號

$ query_search =「SELECT questionnaires_index.id，questionnaires_index.ea_num，questionnaires_index.address，questionnaires_index.status，questionnaires_index.json_stored，users.username FROM questionnaires_index INNER JOIN用戶ON questionnaires_index.interviewer_id = users.id WHERE questionnaires_index.interviewer_id IN（SELECT GROUP_CONCAT（id）FROM users WHERE supervisor =（SELECT id FROM users WHERE username ='「。$ username。」'））「;

Answer 2

您似乎忘了在questionnaires_index.json_stored和users.username之間輸入逗號。

$query_search = "SELECT questionnaires_index.id, questionnaires_index.ea_num, questionnaires_index.address, questionnaires_index.status, questionnaires_index.json_stored ,users.username FROM questionnaires_index INNER JOIN users ON questionnaires_index.interviewer_id = users.id WHERE questionnaires_index.interviewer_id IN (SELECT GROUP_CONCAT(id) FROM users WHERE supervisor = (SELECT id FROM users WHERE username = '".$username."'))