generate_series in postgresql from field in table

Question

Postgresql!

I have a table "meeting"

create table meeting (
id SERIAL, 
name varchar, 
date_start timestamp not null, 
period interval default '0:0:0');

And some data

select * from meeting;
+----+---------------+---------------------+--------+
| id |     name      |     date_start      | period |
+----+---------------+---------------------+--------+
|  1 | Måndagsmöte   | 2017-06-06 09:00:00 | 7 days |
|  2 | torsdagssoppa | 2017-06-01 00:00:00 | 7 days |
+----+---------------+---------------------+--------+

And can select comming meetings from this;

select id,name, date from meeting,
generate_series( 
(select date_start::timestamptz from meeting where id=1)::timestamp,
'2017-08-01 00:00:00', (select period from meeting where id=1)) as date
 where date > '2017-06-15 00:00:00' 
 and date < '2017-07-20 00:00:00' and id=1;

+----+-------------+---------------------+
| id |    name     |        date         |
+----+-------------+---------------------+
|  1 | Måndagsmöte | 2017-06-20 09:00:00 |
|  1 | Måndagsmöte | 2017-06-27 09:00:00 |
|  1 | Måndagsmöte | 2017-07-04 09:00:00 |
|  1 | Måndagsmöte | 2017-07-11 09:00:00 |
|  1 | Måndagsmöte | 2017-07-18 09:00:00 |
+----+-------------+---------------------+

Is there any posibility to relax the "id=1" and have all meetings for all names?

/gh

Answer 1

According to your data you can use the next query:

 select * from (select id, name, generate_series(date_start, '2017-08-01 00:00:00', period) date from meeting) mt where mt.date > '2017-06-15 00:00:00' and mt.date < '2017-07-20 00:00:00' 

\nid |  name |  date                \n-: |  :------------ |  :------------------ \n 1 |  Måndagsmöte |  2017-06-20 09:00:00 \n 1 |  Måndagsmöte |  2017-06-27 09:00:00 \n 1 |  Måndagsmöte |  2017-07-04 09:00:00 \n 1 |  Måndagsmöte |  2017-07-11 09:00:00 \n 1 |  Måndagsmöte |  2017-07-18 09:00:00 \n 2 |  torsdagssoppa |  2017-06-22 00:00:00 \n 2 |  torsdagssoppa |  2017-06-29 00:00:00 \n 2 |  torsdagssoppa |  2017-07-06 00:00:00 \n 2 |  torsdagssoppa |  2017-07-13 00:00:00 \n

dbfiddle here