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UNPIVOT
Learn UNPIVOT in Oracle SQL through the exact construct, a dedicated example, a boundary case, and a mastery check.
UNPIVOT is an atomic Oracle SQL lesson inside Aggregation & Sets. The example uses the specific syntax, command, API, instruction, or language rule named by this lesson.
Study the construct itself, then change one relevant input and predict the result before running it. That keeps this lesson focused on UNPIVOT rather than on generic Oracle SQL syntax.
Topic-specific example
SELECT id,quarter,total FROM sales_wide UNPIVOT(total FOR quarter IN(q1 AS 'Q1',q2 AS 'Q2'));
Test UNPIVOT with an empty result, NULL/missing value, duplicate key, or concurrent operation where relevant; database behavior should be verified at the boundary shown by this example.