This is based on the idea of rows but I want to limit it only to a fast CSV parser with the embeded sqlite query.
This is still is not fully done
brew install jaysonsantos/tools/csv-query
Assuming you already have cargo just run this:
cargo install --git https://github.com/jaysonsantos/csv-query-rs
When the project is mature enough it will be sent to crates.io.
Save these two example files.
user.csv
csv
user_id;name
1;User 1
2;User 2
3;User 3
credits.csv
csv
user_id;credit
1;5
1;30
2;3
1;4
3;1
and you should be able to run this query over it
```bash
$ csv-query -q "
select
u.name, sum(c.credit) credits, avg(c.credit) avgcredits
from table1 u
join table2 c
on u.userid = c.userid
group by u.userid
having avg(c.credit) >= 3" \
-f user.csv -f credits.csv
"name";"credits";"avg_credits" "User 1";"39";"13" "User 2";"3";"3" ```
If you don't need the flexibility of SQLite or want to do things real fast and use a more mature project you should use xsv.