Ok. But how have I change this query: "SELECT "host" FROM "mem_usage_percent"" to get just hosts field? According to documentation it is correct query (https://docs.influxdata.com/influxdb/v1.0/query_language/data_exploration/#the-select-statement-and-the-where-clause)
On Monday, September 26, 2016 at 6:00:06 PM UTC+3, Sean Beckett wrote: > > Every SELECT statement must have at least one field. You selecting only a > tag. Use either "SHOW TAG VALUES" or include a field in the query. > > On Mon, Sep 26, 2016 at 6:55 AM, Paul Letskii <[email protected] > <javascript:>> wrote: > >> Hi all! >> >> InfluxDB version 1.0\ >> >> I'm trying to get list of hosts from measurement "mem_usage_percent". >> >> This query works: >> SELECT * FROM "mem_usage_percent" >> >> This one doesn't: >> SELECT "host" FROM "mem_usage_percent" >> Accordingly to documentation it has to. >> >> My final goal is to count number of unique hosts. Like: SELECT >> count("host") FROM "mem_usage_percent" >> >> What is correct syntax to get information from certain field? >> >> Thank you in advance! >> >> Best regards, >> Paul Letskii >> >> -- >> Remember to include the InfluxDB version number with all issue reports >> --- >> You received this message because you are subscribed to the Google Groups >> "InfluxDB" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> Visit this group at https://groups.google.com/group/influxdb. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/influxdb/f3c71013-7e8c-4fdb-9808-0b1fb35e9052%40googlegroups.com >> >> <https://groups.google.com/d/msgid/influxdb/f3c71013-7e8c-4fdb-9808-0b1fb35e9052%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Sean Beckett > Director of Support and Professional Services > InfluxDB > -- Remember to include the InfluxDB version number with all issue reports --- You received this message because you are subscribed to the Google Groups "InfluxDB" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/influxdb. To view this discussion on the web visit https://groups.google.com/d/msgid/influxdb/215c75a2-3837-4c60-b5bd-14bb26f74fbe%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
