Question

I really think the question I have is not too specific, I just don’t know how to explain it.

Say I have a table with following Collumns

team | gameType | date | outcome

I would like to create a view that lists some statistics about the teams

SELECT team, count(*) as FROM matches GROUP BY team ORDER BY total DESC

Now I want to add columns counting the total

• which were league games
• which have been in the past month
• wins
• losses
• ties

The purpose is to create a view in the database, not any new tables or columns.

Answer 1

You can use case statements in your aggregation functions to aggregate only for specific events.

SELECT 
    team, 
    count(*) total_matches,
    count(case when gameType = 'league' then 1 end) league_matches,
    count(case then date > now() - INTERVAL 30 DAY then 1 end) recent_matches,
    ...
FROM matches 
GROUP BY team