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Selecting time_Stamp >= time('now') GROUP BY firstName RETURNS all first names and same time?

I am trying to select two columns from two different tables, where a value exists in both tables and the time in one table is >= now - 30 minutes. How ever it is returning all the firstnames and then ...
1
vote
1answer
34 views

calculate days spent of all visitors from encounters

I have an encounters table CREATE TABLE visitors( id serial PRIMARY KEY, start_date TIMESTAMP NOT NULL, -- visitor_id bigint NOT NULL -- skip for now, end_date TIMESTAMP ); (end_date can be ...
3
votes
2answers
2k views

How should I represent a midnight end time?

I have a table which represents time ranges. Column | Type | Modifiers -------------+----------------------...
0
votes
2answers
2k views

Getting 30 minute slots between time

I have a Start Datetime and a End Datetime. Eg: 10:00 am - 12:00 pm I have to create 4 slots between the, each ranging for 30 minutes. Eg: 10:00 am-10:30 am 10:30 am-11:00 am 11:00 am-11:30 am ...
2
votes
1answer
449 views

Intervals query of huge data

My question is more or less theoretical - what is the best approch to get query data by intervals. The situation I have a system that manage counters (thousands of counters - counts consumption of ...
-4
votes
1answer
816 views

Get currentmilliseconds in postgres

I'm working on timestamp/datetime in my application. I'm using postgres db. What is the way to get current milliseconds (something like 1412706599000) in postgres?
2
votes
2answers
1k views

Select different time

I looked on the internet and I found your post on the stackexchange. I will try to explain in more detail what we really need I do not know well to write English It is a system for airporttaxi id ...