修改MySQL语句以允许更新

Question

如何用update语句修改？想要更新字段"；电子邮件"；在"；mdl_user"表的值为"0"；[e-mail]"包含此语句返回的所有记录

SELECT DISTINCT u.id AS userid, c.id AS courseid
FROM mdl_user u
JOIN mdl_user_enrolments ue ON ue.userid = u.id
JOIN mdl_enrol e ON e.id = ue.enrolid
JOIN mdl_role_assignments ra ON ra.userid = u.id
JOIN mdl_context ct ON ct.id = ra.contextid
AND ct.contextlevel =50
JOIN mdl_course c ON c.id = ct.instanceid
AND e.courseid = c.id
JOIN mdl_role r ON r.id = ra.roleid
AND r.shortname =  'student'
WHERE e.status =0
AND u.suspended =0
AND u.deleted =0
AND ue.status =0
AND courseid =1538

Answer 1

这将更新所有选定的用户：

UPDATE mdl_user 
JOIN (
SELECT DISTINCT u.id AS userid, c.id AS courseid
FROM mdl_user u
JOIN mdl_user_enrolments ue ON ue.userid = u.id
JOIN mdl_enrol e ON e.id = ue.enrolid
JOIN mdl_role_assignments ra ON ra.userid = u.id
JOIN mdl_context ct ON ct.id = ra.contextid
AND ct.contextlevel =50
JOIN mdl_course c ON c.id = ct.instanceid
AND e.courseid = c.id
JOIN mdl_role r ON r.id = ra.roleid
AND r.shortname =  'student'
WHERE e.status =0
AND u.suspended =0
AND u.deleted =0
AND ue.status =0
AND courseid =1538
) AS a
ON a.userid = mdl_user.id
SET email = '[e-mail]'