Join two queries into two columns - sql

Question

I am new to PostgreSQL and I'm learning a lot in a short time but haven't learnt everything yet so forgive me if this is a simple question.
I have searched for this and a JOIN should bring them together but with my setup I can't get it to work.
PROBLEM
I have a WITH statement that has all the criteria for what I want to search for
Then I wish you perform two SELECT queries, one for each user (only 2 users will be searched for at one time)
DATA
The Data consists of time and an the count of the amount, there will be criteria in the with clause where only the username is used further in the queries.
EXAMPLE
HOUR AMOUNT
01 200
02 300
03 500
04 800
Using a UNION I get both queries in the same column
HOUR AMOUNT
01 200
01 75
02 300
02 50
03 500
03 21
04 800
04 300
But I simply want the second query to appear in a new column
HOUR AMOUNT AMOUNT2
01 200 75
02 300 50
03 500 21
04 800 300
I've simplified the SQL so it's not too long:
WITH My_With AS (
...
)
SELECT time, count(time) AS Column_1
FROM My_With
WHERE
username= 'jon'
GROUP BY time
UNION
SELECT time, count(time) AS Column_2
FROM My_With
WHERE
username= 'bob'
GROUP BY time
ORDER BY time
;
I know this is probably really simple but I just can't figure it out, I've managed to put the second set of amounts into a second column but it still generates 2 tows for the time.

Answer 1

I think you can do what you want with conditional aggregation:
SELECT time,
COUNT(*) FILTER (WHERE username = 'jon') as cnt_jon,
COUNT(*) FILTER (WHERE username = 'bob') as cnt_bob
FROM My_With
GROUP BY time;
Or, with less typing:
SELECT time,
SUM( (username = 'jon')::int ) as cnt_jon,
SUM( (username = 'bob')::int ) as cnt_bob
FROM My_With
GROUP BY time;