InfluxDB?????????InfluxDB????????????????????????????????????
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?????????sum
1???count()??????
???????????????field????????????????????????????????????
?????????
SELECT COUNT(<field_key>) FROM <measurement_name> [WHERE <stuff>] [GROUP BY <stuff>]
?????????
>SELECT COUNT(water_level) FROM h2o_feet name: h2o_feet--------------time count1970-01-01T00:00:00Z 15258
?????? water_level??????????????? h2o_feet????????????15258????????????
?????????InfluxDB????????????????????????????????????????????????????????? epoch 0 (1970-01-01T00:00:00Z) ???????????????
?????????where ?????????????????????????????????
> SELECT COUNT(water_level) FROM h2o_feet WHERE time >= ???2015-08-18T00:00:00Z??? AND time < ???2015-09-18T17:00:00Z??? GROUP BY time(4d) name: h2o_feet--------------time count2015-08-17T00:00:00Z 14402015-08-21T00:00:00Z 19202015-08-25T00:00:00Z 19202015-08-29T00:00:00Z 19202015-09-02T00:00:00Z 19152015-09-06T00:00:00Z 19202015-09-10T00:00:00Z 19202015-09-14T00:00:00Z 19202015-09-18T00:00:00Z 335
???????????????????????????????????????
2???DISTINCT()??????
?????????????????????field??????????????????
?????????
SELECT DISTINCT(<field_key>) FROM <measurement_name> [WHERE <stuff>] [GROUP BY <stuff>]
????????????
> SELECT DISTINCT("level description") FROM h2o_feet
name: h2o_feet--------------time distinct1970-01-01T00:00:00Z between 6 and 9 feet1970-01-01T00:00:00Z below 3 feet1970-01-01T00:00:00Z between 3 and 6 feet1970-01-01T00:00:00Z at or greater than 9 feet??????????????????level description????????????????????????????????????????????????????????????????????????????????????
3???MEAN() ??????
?????????????????????field?????????????????????????????????????????????????????????????????????????????????float64???
???????????????
SELECT MEAN(<field_key>) FROM <measurement_name> [WHERE <stuff>] [GROUP BY <stuff>]
????????????
> SELECT MEAN(water_level) FROM h2o_feet name: h2o_feet--------------time mean1970-01-01T00:00:00Z 4.286791371454075
??????water_level?????????????????????4.286791371454075
???????????????????????????????????????????????????where?????????
4???MEDIAN()??????
??????????????????field??????????????????????????????????????????????????????????????????????????????????????????float64?????????
?????????
SELECT MEDIAN(<field_key>) FROM <measurement_name> [WHERE <stuff>] [GROUP BY <stuff>]
????????????
> SELECT MEDIAN(water_level) from h2o_feet name: h2o_feet--------------time median1970-01-01T00:00:00Z 4.124
???????????? water_level????????????????????? 4.124
5???SPREAD()??????
??????????????????????????????????????????????????????????????????????????????????????????float64???
?????????
SELECT SPREAD(<field_key>) FROM <measurement_name> [WHERE <stuff>] [GROUP BY <stuff>]
????????????
> SELECT SPREAD(water_level) FROM h2o_feet name: h2o_feet--------------time spread1970-01-01T00:00:00Z 10.574
6???SUM()??????
??????????????????????????????????????????????????????????????????????????????float64???
?????????
SELECT SUM(<field_key>) FROM <measurement_name> [WHERE <stuff>] [GROUP BY <stuff>]
???????????????
> SELECT SUM(water_level) FROM h2o_feet name: h2o_feet--------------time sum1970-01-01T00:00:00Z 67777.66900000002
???????????? ???DBSpace??? ?????????????????????????????????http://dbspace.blog.51cto.com/6873717/1880954
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