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select * from ( select c.OrderNumber , c.Name as equipmentName, a.*, d.Starttime, d.Endtime, ( select datediff(d.Starttime, d.Endtime)) as Lev , case ( select datediff(d.Starttime, d.Endtime)) when ( select datediff(d.Starttime, d.Endtime)) <=10 then ‘緊急維修‘ when 10<( select datediff(d.Starttime, d.Endtime))<=30 then ‘預計維修‘ else ‘無需維修‘ end as LevName from cloud_componentlist a left join cloud_equipmentcomponen b on a.Id= b.component left join cloud_equipment c on c.EquipmentId = b.EquipmentId left join (select * from cloud_componentrepairrecord limit 0, 1 order by CreateDate desc ) d on d.Cloud_componentId= a.Id where 1=1 order by Lev desc ) a limit 0,10;

mysql 時間向減寫法