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2025-04-26 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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The following is a memo only
Suppose there is the following table [FM_ALARM]
RES_ID : Unique identification of the resource OCCUR_TIME : Time of occurrence (millisecond timestamp)SEVERITY : Alarm level
The data changes in real time. If I want to take out the latest record of all the data, I can use the following SQL
select res_id, severity from fm_alarm t where not exists (select 1 from fm_alarm where t.res_id = res_id and t.occur_time < occur_time)
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