小程序系统问题。忘有关的技术人员说明下什么问题

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'zjhj_bd_statistics_user_log.created_at' in 'where clause' The SQL being executed was: SELECT COUNT() FROM (SELECT su. FROM zjhj_bd_statistics_user_log su LEFT JOIN zjhj_bd_user u ON zjhj_bd_statistics_user_log.user_id = u.id WHERE ((su.mall_id=4) AND (su.is_delete=0)) AND (su.mch_id=501) AND (u.be_mch_id=501) AND (zjhj_bd_statistics_user_log.created_at >= '2021-08-20 00:00:00') AND (zjhj_bd_statistics_user_log.created_at <= '2021-08-20 23:59:59') GROUP BY zjhj_bd_statistics_user_log.user_id) `c

错误提示很明显，sql中的zjhj_bd_statistics_user_log.created_at字段不存在。