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Possible Duplicate:
COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better?
I want to retrieve the count from a select query.
What is faster: count(*) or count(table_field_name)?
I want to know which way is faster for performance.
The difference is
Count(field)returns count of NOT NULL values in the field, whetherCOUNT(*)returns COUNT of rows.COUNT(*)in MyIsam should be faster.http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_count