Postgres: How to use value of field in subquery - sql

Question

I have db table like this:
id | user | service | pay_date | status
---+------+---------+--------------+------------
1 | john | 1 | 2014-08-20 | 1
2 | john | 3 | 2014-07-24 | 0
I am trying to build query which return all users who are not payed service 1 or service 3 between 2 dates and haven`t active services (status = 0 for service 1 and service 2). The problem is that query return service 3, but this is not correct because service 1 is active.
SELECT *
FROM services
WHERE date > 2014-07-01
AND date < 2014-07-30
AND service = 1 OR service = 3
My solution is to check if service 3 is active when i`am checking service 1. Something like that...
SELECT *
FROM services
WHERE date > 2014-07-01
AND date < 2014-07-30
AND ((service = 1 AND "SERVICE 3 IS NOT ACTIVE") OR service = 3)
but i cant check if "SERVICE 3 IS NOT ACTIVE" for current user

Answer 1

I think you want NOT EXISTS, i.e. checking that another active record does not exist for the same user, possibly something like:
SELECT *
FROM Services
WHERE Service IN (1, 3)
AND pay_date > '2014-07-01'
AND pay_date < '2014-07-30'
AND NOT EXISTS
( SELECT 1
FROM services AS s2
WHERE s2.Name = s.Name
AND s2.Status = 1
AND s2.Service IN (1, 3)
AND s2.pay_date > '2014-07-01'
AND s2.pay_date < '2014-07-30'
);

Answer 2

There is no single record that meets all those criteria.
id 1 record cannot be both service = 1 & service = 3 at the some time
id | user | service | pay_date | status
---+------+---------+--------------+------------
1 | john | 1 | 2014-08-20 | 1
id 2 record cannot be both service = 1 & service = 3 at the some time
id | user | service | pay_date | status
---+------+---------+--------------+------------
2 | john | 3 | 2014-08-24 | 0 -- nb: I changed this date!
SO: your criteria require comparing record 1 to record 2 (or more broadly, that you have to compare "across records"). below I use EXISTS to compare across records.
SELECT
*
FROM services
WHERE (pay_date >= '2014-08-01'
AND pay_date < '2014-08-30')
AND service = 1
AND EXISTS (
SELECT
NULL
FROM services s3
WHERE (s3.pay_date >= '2014-08-01'
AND s3.pay_date < '2014-08-30')
AND s3.service = 3
and s3.status = 1
AND s3.user = services.user
)
see SQLfiddle Demo
by the way, it is more conventional to use a date range via >= & <