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SQL Proficiency Level
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SQL Proficiency Level

MediumSQL · PostgreSQL

Problem

What is your SQL proficiency level?

Demonstrate your level by querying the provided tables. Return one row for every technician, including technicians without qualifying completed work orders. Include only work orders completed during 2025.

Output

  1. Columns: technician_name, completed_work_orders, average_duration_hours, proficiency_band
  2. Assign High for at least 3 completed work orders, Standard for 1 or 2, and No completed work for 0.
  3. Order by completed work orders descending, average duration descending, then technician name ascending.

Schema

technicians
ColumnTypeDescription
technician_idPKINTUnique technician identifier
technician_nameVARCHAR(100)Technician's full name
work_orders
ColumnTypeDescription
work_order_idPKINTUnique work order identifier
technician_idINTAssigned technician identifier
statusVARCHAR(30)Current work order status
completion_dateDATEDate the work order was completed
duration_hoursNUMERIC(6,2)Hours spent completing the work order
Tablestechnicianswork_orders
Interviewer

Your question is SQL Proficiency Level. Start with the requirements and the two tables in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

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CodePostgreSQL
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