mysql 查詢某個字段爲空或不爲空的數據

mysql 查詢某個字段爲空或不爲空的數據 某個字段爲空的數據：select * from evt_t_pub_audit_msg_report where userName is null or trim(userName)=''; 某個字段不爲空的數據：select * from evt_t_pub_audit_msg_report where trim(userName)!='';

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