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SQL Execution Order
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SQL Execution Order

HardSQL · PostgreSQL

Problem

What is the sequence of execution in SQL?

Explain the logical processing order and write a PostgreSQL query that demonstrates the sequence using the provided tables. The query should include filtering, aggregation, a minimum group condition, ranking, sorting, and limiting.

Output

  1. Return department_name, passed_runs, and run_rank.
  2. Include departments with at least two qualifying runs.
  3. Sort by rank, then department name, and return the first three rows.

Schema

departments
ColumnTypeDescription
department_idPKINTUnique department identifier
department_nameVARCHAR(100)Department name
test_runs
ColumnTypeDescription
run_idPKINTUnique test run identifier
department_idINTDepartment associated with the run
run_dateDATEDate the test run completed
statusVARCHAR(20)Test run result status
Tablesdepartmentstest_runs
Interviewer

Your question is SQL Execution Order. Start with the requirements and the two tables in the Question tab.

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