38 lines
1.2 KiB
MySQL
38 lines
1.2 KiB
MySQL
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create or replace function total_energy_by_day_and_device(p_day date, p_device varchar)
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returns double precision
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language plpgsql
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as $$
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declare
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v_firstEnergy double precision;
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v_lastEnergy double precision;
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v_total double precision;
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begin
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select energy
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into v_lastEnergy
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from power_measurement_t
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where time = (
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select max(time)
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from power_measurement_t
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where time between p_day + time '00:00' and p_day + time '00:00' + interval '24h' and
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deviceid = p_device and
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status = 'Ok'
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) and
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deviceid = p_device;
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select energy
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into v_firstEnergy
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from power_measurement_t
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where time = (
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select min(time)
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from power_measurement_t
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where time between p_day + time '00:00' and p_day + time '00:00' + interval '24h' and
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deviceid = p_device and
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status = 'Ok'
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) and
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deviceid = p_device;
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v_total := v_lastEnergy - v_firstEnergy;
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return v_total;
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end;
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$$;
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