Calculate duration from timestamps in one column SQL postgres

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I have a database in Postgres SQL with information on users browsing online content. I would like to calculate the duration of browsing for each browsing episode (episode is one start and one stop action for the same Action_ID) and then to see it per user and per day.
I can identify users by User_ID and by Action column to see when browsing started and ended.

I am therefore stuck with figuring out how to instead of having two rows per Action (with start and stop time) make one row per browsing Action with duration time only?

Date_time User_ID Device_ID Action Action_ID Channel_ID
22/07/2016 00:10 id2 pc stop 123qwe gn3
22/07/2016 00:10 id5 pc start 345ert tm6
22/07/2016 00:10 id1 mob stop 567rfg uy6
22/07/2016 00:12 id1 mob start 567rfg uy6
22/07/2016 00:13 d3 pc stop 987yhn io9

I've tried Calculate duration between momentjs timestamps in UTC and Calculate duration between timestamps in one column already and I've done some googling, but I didn't get any closer.

Thanks!

edited Nov 10 at 18:17

asked Nov 10 at 17:55

Iamadriana

Please explain the logic for defining "browsing episode".
– Gordon Linoff
Nov 10 at 17:57

browsing episode would be the time between 'start' and 'stop' for the same Action_ID
– Iamadriana
Nov 10 at 18:05

@GordonLinoff just edited, it should be there now
– Iamadriana
Nov 10 at 18:18

add a comment |

up vote
0
down vote

favorite

I am therefore stuck with figuring out how to instead of having two rows per Action (with start and stop time) make one row per browsing Action with duration time only?

Date_time User_ID Device_ID Action Action_ID Channel_ID
22/07/2016 00:10 id2 pc stop 123qwe gn3
22/07/2016 00:10 id5 pc start 345ert tm6
22/07/2016 00:10 id1 mob stop 567rfg uy6
22/07/2016 00:12 id1 mob start 567rfg uy6
22/07/2016 00:13 d3 pc stop 987yhn io9

I've tried Calculate duration between momentjs timestamps in UTC and Calculate duration between timestamps in one column already and I've done some googling, but I didn't get any closer.

Thanks!

edited Nov 10 at 18:17

asked Nov 10 at 17:55

Iamadriana

Please explain the logic for defining "browsing episode".
– Gordon Linoff
Nov 10 at 17:57

browsing episode would be the time between 'start' and 'stop' for the same Action_ID
– Iamadriana
Nov 10 at 18:05

@GordonLinoff just edited, it should be there now
– Iamadriana
Nov 10 at 18:18

add a comment |

up vote
0
down vote

favorite

I am therefore stuck with figuring out how to instead of having two rows per Action (with start and stop time) make one row per browsing Action with duration time only?

Date_time User_ID Device_ID Action Action_ID Channel_ID
22/07/2016 00:10 id2 pc stop 123qwe gn3
22/07/2016 00:10 id5 pc start 345ert tm6
22/07/2016 00:10 id1 mob stop 567rfg uy6
22/07/2016 00:12 id1 mob start 567rfg uy6
22/07/2016 00:13 d3 pc stop 987yhn io9

I've tried Calculate duration between momentjs timestamps in UTC and Calculate duration between timestamps in one column already and I've done some googling, but I didn't get any closer.

Thanks!

edited Nov 10 at 18:17

asked Nov 10 at 17:55

Iamadriana

I am therefore stuck with figuring out how to instead of having two rows per Action (with start and stop time) make one row per browsing Action with duration time only?

Date_time User_ID Device_ID Action Action_ID Channel_ID
22/07/2016 00:10 id2 pc stop 123qwe gn3
22/07/2016 00:10 id5 pc start 345ert tm6
22/07/2016 00:10 id1 mob stop 567rfg uy6
22/07/2016 00:12 id1 mob start 567rfg uy6
22/07/2016 00:13 d3 pc stop 987yhn io9

I've tried Calculate duration between momentjs timestamps in UTC and Calculate duration between timestamps in one column already and I've done some googling, but I didn't get any closer.

Thanks!

sql postgresql

edited Nov 10 at 18:17

asked Nov 10 at 17:55

Iamadriana

edited Nov 10 at 18:17

asked Nov 10 at 17:55

Iamadriana

edited Nov 10 at 18:17

asked Nov 10 at 17:55

Iamadriana

asked Nov 10 at 17:55

Iamadriana

asked Nov 10 at 17:55

Iamadriana

Please explain the logic for defining "browsing episode".
– Gordon Linoff
Nov 10 at 17:57

browsing episode would be the time between 'start' and 'stop' for the same Action_ID
– Iamadriana
Nov 10 at 18:05

@GordonLinoff just edited, it should be there now
– Iamadriana
Nov 10 at 18:18

add a comment |

Please explain the logic for defining "browsing episode".
– Gordon Linoff
Nov 10 at 17:57

browsing episode would be the time between 'start' and 'stop' for the same Action_ID
– Iamadriana
Nov 10 at 18:05

@GordonLinoff just edited, it should be there now
– Iamadriana
Nov 10 at 18:18

Please explain the logic for defining "browsing episode".
– Gordon Linoff
Nov 10 at 17:57

browsing episode would be the time between 'start' and 'stop' for the same Action_ID
– Iamadriana
Nov 10 at 18:05

@GordonLinoff just edited, it should be there now
– Iamadriana
Nov 10 at 18:18

add a comment |

1 Answer
1

active

oldest

votes

up vote
0
down vote

You can get the dates as:

select date_trunc('day', date_time) as theday, user_id, action_id,
 min(date_time) filter (where action = 'start') as start_time,
 max(date_time) filter (where action = 'stop') as stop_time
from t
group by theday, user_id, action_id;

The duration is then the difference between these -- but the exactly logic depends on how you want to see the duration.

answered Nov 10 at 18:16

Gordon Linoff

744k32285390

I tried this solution and it gave me an Error: "function date_trunc(unknown, character varying) does not exist. No function matches the given name and argument types." I thought this is caused because of the 'date_time' column data type and I tried changing it to timestamp with CAST. This didn't work - is that because there are no seconds in the 'date_time' column?
– Iamadriana
Nov 10 at 19:48

Fix your data so the date is stored as a datetime and not a string. date_trunc() works fine in Postgres. You could try 'day'::text after fixing the column type.
– Gordon Linoff
Nov 10 at 19:54

Thanks Gordon, I fixed the datatype and I split my data into 2 separated columns instead : one with date and one with time. Thus, the above solution is not calculating the desired output of duration time of action from start to stop in minutes.
– Iamadriana
Nov 11 at 19:07

add a comment |

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1 Answer
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active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
0
down vote

You can get the dates as:

select date_trunc('day', date_time) as theday, user_id, action_id,
 min(date_time) filter (where action = 'start') as start_time,
 max(date_time) filter (where action = 'stop') as stop_time
from t
group by theday, user_id, action_id;

The duration is then the difference between these -- but the exactly logic depends on how you want to see the duration.

answered Nov 10 at 18:16

Gordon Linoff

744k32285390

I tried this solution and it gave me an Error: "function date_trunc(unknown, character varying) does not exist. No function matches the given name and argument types." I thought this is caused because of the 'date_time' column data type and I tried changing it to timestamp with CAST. This didn't work - is that because there are no seconds in the 'date_time' column?
– Iamadriana
Nov 10 at 19:48

Fix your data so the date is stored as a datetime and not a string. date_trunc() works fine in Postgres. You could try 'day'::text after fixing the column type.
– Gordon Linoff
Nov 10 at 19:54

Thanks Gordon, I fixed the datatype and I split my data into 2 separated columns instead : one with date and one with time. Thus, the above solution is not calculating the desired output of duration time of action from start to stop in minutes.
– Iamadriana
Nov 11 at 19:07

add a comment |

up vote
0
down vote

You can get the dates as:

select date_trunc('day', date_time) as theday, user_id, action_id,
 min(date_time) filter (where action = 'start') as start_time,
 max(date_time) filter (where action = 'stop') as stop_time
from t
group by theday, user_id, action_id;

The duration is then the difference between these -- but the exactly logic depends on how you want to see the duration.

answered Nov 10 at 18:16

Gordon Linoff

744k32285390

I tried this solution and it gave me an Error: "function date_trunc(unknown, character varying) does not exist. No function matches the given name and argument types." I thought this is caused because of the 'date_time' column data type and I tried changing it to timestamp with CAST. This didn't work - is that because there are no seconds in the 'date_time' column?
– Iamadriana
Nov 10 at 19:48

Fix your data so the date is stored as a datetime and not a string. date_trunc() works fine in Postgres. You could try 'day'::text after fixing the column type.
– Gordon Linoff
Nov 10 at 19:54

Thanks Gordon, I fixed the datatype and I split my data into 2 separated columns instead : one with date and one with time. Thus, the above solution is not calculating the desired output of duration time of action from start to stop in minutes.
– Iamadriana
Nov 11 at 19:07

add a comment |

up vote
0
down vote

You can get the dates as:

select date_trunc('day', date_time) as theday, user_id, action_id,
 min(date_time) filter (where action = 'start') as start_time,
 max(date_time) filter (where action = 'stop') as stop_time
from t
group by theday, user_id, action_id;

The duration is then the difference between these -- but the exactly logic depends on how you want to see the duration.

answered Nov 10 at 18:16

Gordon Linoff

744k32285390

You can get the dates as:

select date_trunc('day', date_time) as theday, user_id, action_id,
 min(date_time) filter (where action = 'start') as start_time,
 max(date_time) filter (where action = 'stop') as stop_time
from t
group by theday, user_id, action_id;

The duration is then the difference between these -- but the exactly logic depends on how you want to see the duration.

answered Nov 10 at 18:16

Gordon Linoff

744k32285390

answered Nov 10 at 18:16

Gordon Linoff

744k32285390

answered Nov 10 at 18:16

Gordon Linoff

744k32285390

answered Nov 10 at 18:16

Gordon Linoff

744k32285390

I tried this solution and it gave me an Error: "function date_trunc(unknown, character varying) does not exist. No function matches the given name and argument types." I thought this is caused because of the 'date_time' column data type and I tried changing it to timestamp with CAST. This didn't work - is that because there are no seconds in the 'date_time' column?
– Iamadriana
Nov 10 at 19:48

Fix your data so the date is stored as a datetime and not a string. date_trunc() works fine in Postgres. You could try 'day'::text after fixing the column type.
– Gordon Linoff
Nov 10 at 19:54

Thanks Gordon, I fixed the datatype and I split my data into 2 separated columns instead : one with date and one with time. Thus, the above solution is not calculating the desired output of duration time of action from start to stop in minutes.
– Iamadriana
Nov 11 at 19:07

add a comment |

I tried this solution and it gave me an Error: "function date_trunc(unknown, character varying) does not exist. No function matches the given name and argument types." I thought this is caused because of the 'date_time' column data type and I tried changing it to timestamp with CAST. This didn't work - is that because there are no seconds in the 'date_time' column?
– Iamadriana
Nov 10 at 19:48

Fix your data so the date is stored as a datetime and not a string. date_trunc() works fine in Postgres. You could try 'day'::text after fixing the column type.
– Gordon Linoff
Nov 10 at 19:54

Thanks Gordon, I fixed the datatype and I split my data into 2 separated columns instead : one with date and one with time. Thus, the above solution is not calculating the desired output of duration time of action from start to stop in minutes.
– Iamadriana
Nov 11 at 19:07

I tried this solution and it gave me an Error: "function date_trunc(unknown, character varying) does not exist. No function matches the given name and argument types." I thought this is caused because of the 'date_time' column data type and I tried changing it to timestamp with CAST. This didn't work - is that because there are no seconds in the 'date_time' column?
– Iamadriana
Nov 10 at 19:48

Fix your data so the date is stored as a datetime and not a string. date_trunc() works fine in Postgres. You could try 'day'::text after fixing the column type.
– Gordon Linoff
Nov 10 at 19:54

Thanks Gordon, I fixed the datatype and I split my data into 2 separated columns instead : one with date and one with time. Thus, the above solution is not calculating the desired output of duration time of action from start to stop in minutes.
– Iamadriana
Nov 11 at 19:07

add a comment |

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