SQLSTATE [42S22]:莫名其妙出现这个问题?
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'user_id' in
'field list' (SQL: select user_id, count(*) as topic_count from u sers
where created_at
>= 2018-07-30 07:02:23 group by user_id
)
好像关于活跃用户的, 又没大佬 解决i 啊
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