menu_book Course Curriculum (Oracle SQL Complete Course) expand_more
ROWNUM
Learn ROWNUM in Oracle SQL through the exact construct, a dedicated example, a boundary case, and a mastery check.
ROWNUM is an atomic Oracle SQL lesson inside Core Oracle SQL. 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 ROWNUM rather than on generic Oracle SQL syntax.
Topic-specific example
SELECT * FROM (SELECT * FROM orders ORDER BY created_at DESC) WHERE ROWNUM<=10;
Test ROWNUM 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.