What is rule base and cost base optimizer?
Answers were Sorted based on User's Feedback
Answer / chandra shekher
Rule based optimiser will optimise the query based on the
rules.
Cost based optimiser will optimise the query based on the
statistics available for the table.
Is This Answer Correct ? | 4 Yes | 1 No |
Answer / chandra bhusan prasad
one is supported in 8i and another in 9i/10g
cost base optimizer display the cost attributes of query
and it is easier.
Is This Answer Correct ? | 1 Yes | 3 No |
how to eliminate null values in a column i.e table vlaues 1 2 3 NULL 3 4 1 5 NULL i want output like this 1 2 3 3 4 1 5 i dnt want to use nvl is null and i dnt want replace the NULL value with any value i.e nvl(col,o);
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