SELECT uusername ppname FROM passenger as p JOIN user as u ON pusername = uusername WHERE uusername LIKE 张 GROUP BY uusername修改成查询每个账号各自添加了多少个姓张的旅客
SELECT u.username, COUNT(*) AS count_zhang FROM passenger AS p JOIN user AS u ON p.username = u.username WHERE u.username LIKE '张%' GROUP BY u.username
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