entender el ejemplo de código de Oracle first_rows

Ejemplo: primera fila de Oracle

SELECT * FROM (SELECT [COLUMNS] FROM [TABLE] ORDER BY [DATE] DESC)
    WHERE ROWNUM = 1;
-- Oracle 12c:
SELECT * FROM (SELECT [COLUMNS] FROM [TABLE] ORDER BY [DATE] DESC) 
    FETCH FIRST 1 ROW ONLY;
SELECT * FROM (SELECT [COLUMNS] FROM [TABLE] ORDER BY [DATE] DESC) 
    FETCH FIRST 10 ROW ONLY;
SELECT * FROM (SELECT [COLUMNS] FROM [TABLE] ORDER BY [DATE] DESC) 
    FETCH FIRST 10 ROWS ONLY;

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