Re: count records in two different table joined by

[Thomas Markus <t.markus@xxxxxxxxxxxxx>]

Hi,

Am 07.07.17 um 12:16 schrieb Patrick B:

Hi guys!

I've got 2 tables, and I need to get some data between them.

test1:

WITH account_status AS (

select 

CASE 

  WHEN regdate = 1 THEN 'yes'

  WHEN regdate = 2 THEN 'no'

  from test1

  end as status_a

)

select status_a from account_status group by status_a

test2:

WITH user_status AS (

select 

CASE 

  WHEN regdate = 1 THEN 'yes'

  WHEN regdate = 2 THEN 'no'

  from test1

  join test2 as t2 on t2.test1_id = t1.id

  end as status_a

)

select status_a from user_status group by status_a

It works fine.. but I would like to get that data in one single query.. How can I do that?

I'm using Postgres 9.3.

Thanks!
Patrick

one possibility is:

select distinct
    case
        when regdate = 1 THEN 'yes'
        when regdate = 2 THEN 'no'
    end as status_a
    , t2.id is null as test2exists
from test1 t1 left join test2 t2 on t2.test1_id = t1.id

hth
Thomas