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SQL for Top Bottlenecks
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SQL for Top Bottlenecks

MediumSQL · PostgreSQL

Problem

How would you use SQL to identify the top 5 operational bottlenecks by average resolution time over the last quarter at Aon?

Use the operational bottleneck and ticket data to include only valid, resolved tickets opened during the last completed calendar quarter.

Output

  1. One row per bottleneck with resolved tickets in the period
  2. Columns: bottleneck_id, bottleneck_name, avg_resolution_hours, and resolved_ticket_count
  3. Return only the five highest averages, ordered descending by average resolution time, with bottleneck_id ascending as the tie-breaker

Schema

operational_bottlenecks
ColumnTypeDescription
bottleneck_idPKINTUnique identifier for an operational bottleneck
bottleneck_nameVARCHAR(100)Name of the operational bottleneck
operational_tickets
ColumnTypeDescription
ticket_idPKINTUnique ticket identifier
bottleneck_idINTReferenced operational bottleneck
opened_atTIMESTAMPTimestamp when the ticket was opened
resolved_atTIMESTAMPTimestamp when the ticket was resolved
Tablesoperational_bottlenecksoperational_tickets
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