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Oracle: which of the following is better to find the number of rows in a table?

+1 vote
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which of the following is better to find the number of rows in a table?
1. count(1)
2. count(*)
3. count(rowid)

posted Mar 9, 2015 by Suchithra

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2 Answers

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answer Mar 9, 2015 by Amit Kumar Pandey
0 votes

the answer is 1. and 3.

The function count() executes faster when given a criteria/value which is quicker to resolve in the sql processing mechanism.Thus, an integer or rowid are faster to resolve than an '*'which is a wild card symbol for all the colums in a table and hence it is more time consuming.

answer Mar 10, 2015 by Arun Gowda
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