Q:

Getting Distinct Count from two tables

I have two tables for example 
table1 as 

╔══════════╦════════════╗
║    id    ║ login_id   ║
╠══════════╬════════════╣
║        1 ║          2 ║
║        2 ║          2 ║
║        3 ║          2 ║
║        4 ║          1 ║
╚══════════╩════════════╝
and table2 as 
╔══════════╦════════════╗
║    id2   ║ login_id   ║
╠══════════╬════════════╣
║        1 ║          3 ║
║        2 ║          1 ║
║        3 ║          2 ║
║        4 ║          1 ║
╚══════════╩════════════╝
I need to get the count of column login_id from the two tables where there is no duplicate
I have tried 

SELECT COUNT(DISTINCT t1.login_id), COUNT(DISTINCT t2.login_id) FROM table1 as t1 JOIN table2 AS t2

I got 
COUNT(DISTINCT t1.login_id) 2
COUNT(DISTINCT t2.login_id) 3.
Is there any way that I can the output to be only 3. 
Hope that it's clear to understand what I want.

A:

Use UNION  :
select count(*)
from (select login_id 
      from table1 union -- WILL REMOVE DUPLICATE
      select login_id 
      from table2
     ) t;

