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SELECT DATE_TRUNC('hour', "core_tankdata"."record_time" AT TIME ZONE 'Asia/Almaty') AS "hour",
COUNT(DATE_TRUNC('hour', "core_tankdata"."record_time" AT TIME ZONE 'Asia/Almaty')) AS "experiments",
round(AVG("core_tankdata"."volume")::numeric,2) as "avg_volume",
round(AVG("core_tankdata"."density")::numeric,3) as "avg_density",
round(AVG("core_tankdata"."mass")::numeric,2) as "avg_mass",
round(AVG("core_tankdata"."level")::numeric,2) as "avg_level"
FROM "core_tankdata" WHERE ("core_tankdata"."record_time" >= '2020-01-01 00:00:00+06:00'
AND "core_tankdata"."record_time" <= '2020-04-23 23:59:59+06:00')
GROUP BY DATE_TRUNC('hour', "record_time" AT TIME ZONE 'Asia/Almaty') ORDER BY "hour" ASC