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Update QUERIES.md

pull/1450/head
Paul Dix 2015-01-29 16:25:12 -05:00
parent 13763187a7
commit 61a91002d9
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QUERIES.md
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@ -48,11 +48,9 @@ where `<privilege> := READ | WRITE | All [PRIVILEGES]`.
# Select
```sql
-- get the top 10 host measurements for the last hour (same host can appear multiple times)
SELECT top(10, value), host FROM cpu WHERE time > now() - 1h
SELECT mean(value) from cpu WHERE host = 'serverA' AND time > now() - 4h GROUP BY time(5m)
-- get the top 10 unique hosts for the last hour
SELECT top(10, value), distinct(host) FROM cpu WHERE time > now() - 1h
SELECT mean(value) from cpu WHERE time > now() - 4h GROUP BY time(5m), region
```
## Group By
@ -68,9 +66,9 @@ DROP MEASUREMENT <name>
DROP MEASUREMENT cpu WHERE region = 'uswest'
```
## List
## Show
List series queries are for pulling out individual series from measurement names and tag data. They're useful for discovery.
Show series queries are for pulling out individual series from measurement names and tag data. They're useful for discovery.
```sql
-- show all databases
@ -107,8 +105,8 @@ SHOW TAG KEYS FROM cpu
SHOW TAG KEYS FROM temperature, wind_speed
-- show all the tag values. note that a single WHERE TAG KEY = '...' clause is required
SHOW TAG VALUES WHERE TAG KEY = 'region'
SHOW TAG VALUES FROM cpu WHERE region = 'uswest' and TAG KEY = 'host'
SHOW TAG VALUES WITH TAG KEY = 'region'
SHOW TAG VALUES FROM cpu WHERE region = 'uswest' WITH TAG KEY = 'host'
-- and you can do stuff against fields
SHOW FIELD KEYS FROM cpu