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Key to solving deductive logic puzzles is coming up with a strategy for identifying and discarding possibilities in a systematic fashion.
Author: Kim Berg Hansen [45888-10344969]
Adding a column with a default value will set this value for all existing rows.
Setting a default value for an existing column has no effect on existing rows.
ROWNUM and ORDER BY on the same level in a query will not give you a ROWNUM in the order of the ORDER BY. For that you either need ORDER BY in inline view and ROWNUM in outer query, or you can use ROW_NUMBER analytic function.