Campaign Efficiency Metrics and Below-Average CTR

In this PostgreSQL task, the input is an ad_campaigns table that stores one row per advertising campaign. Column Type Meaning campaign_id INTEGER Unique campaign identifier campaign_name VARCHAR Campaign display name start_date DATE First active day, inclusive end_date DATE Last active day, inclusive daily_budget NUMERIC(12,2) Planned budget for each active day impressions INTEGER Recorded impressions clicks INTEGER Recorded clicks conversions INTEGER Recorded conversions…