campaign_daily (campaign_id, day, visits, conversions) records each campaign's traffic per day.
Report each campaign's total visits, total conversions and its conversion_pct: the share of its visits that converted, as a percentage rounded to 2 decimal places. Add an overall row with campaign_id = 'ALL' whose numbers describe all traffic together: its conversion rate is the share of all visits that converted.
Columns: campaign_id, visits, conversions, conversion_pct. Sort by campaign_id, with the 'ALL' row last.