21. Highest and Lowest Earner
MediumCTEsORDER BY + LIMIT inside a CTEUNION ALLfinal ordering
ORDER BY ... LIMIT is meaningful inside a CTE — it picks
which row survives. But the order of the final output is only guaranteed by the
outer query's ORDER BY. This problem makes both ideas concrete.
Task: return two rows — the highest earner and the lowest earner — each
labelled. Columns: kind ('highest' or 'lowest'), name, salary.
Order the final result by salary descending.
Tables
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Expected outputrows must come back in this order
Computing expected output…
This is the result for the example data above. On Submit your query is graded against this example plus 4 hidden edge cases — 5test cases in all. A sloppy query that only fits the example won't pass.
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