Q24. Weekday pattern. SQLite: strftime('%w') gives 0 for Sunday.   [7 row(s)]
dow | day | bills | charged
----+-----+-------+---------
0   | Sun | 458   | 22099000
1   | Mon | 430   | 21653000
2   | Tue | 400   | 19940000
3   | Wed | 382   | 18336000
4   | Thu | 413   | 19725000
5   | Fri | 361   | 17179000
6   | Sat | 509   | 25281000
