delete
from
yanfan_log.device_log
where
ts < '2026-02-02 09:51:22.437'
**and** serial_number = 'D0287HBNJ5Z3'
**and** **\`identity\`** = 'mq_lj_flow' 执行不成功 **delete**
from
yanfan_log.device_log
where
ts < '2026-02-02 09:51:22.437'
**and** serial_number = 'D0287HBNJ5Z3'
**执行成功。 identity不是标签**
