GROUP BY clause
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GROUP BY clause to group data by values.
GROUP BY is an optional clause used to group rows that have the same values for all columns and expressions in the list.
To output an aggregation for each group, include an aggregate or selector function in the
GROUP BY appears in a query, the
SELECT list can only use columns that appear in the
GROUP BY list
or in aggregate expressions.
GROUP BY can use column aliases that are defined in the
GROUP BY can’t use an alias named
GROUP BY list,
time always refers to the measurement
SELECT AGGREGATE_FN(field1), tag1 FROM measurement GROUP BY tag1
Group data by tag values
SELECT AVG("water_level") AS "avg_water_level", "location" FROM "h2o_feet" GROUP BY "location"
Group results in 15 minute time intervals by tag:
SELECT "location", DATE_BIN(INTERVAL '15 minutes', time, TIMESTAMP '2022-01-01 00:00:00Z') AS _time, COUNT("water_level") AS count FROM "h2o_feet" WHERE time >= timestamp '2019-09-17T00:00:00Z' AND time <= timestamp '2019-09-17T01:00:00Z' GROUP BY _time, location ORDER BY location, _time
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