I wasn’t sure if it recounted the rows, or if after it retrieved the whole result set, it only grabbed the total post query?
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I wasn’t sure if it recounted the rows, or if after it retrieved the whole result set, it only grabbed the total post query?
when you run a statement, mysql sends the row count in the header. so no, the query is not re-run to get the count.
this has an interesting implication for queries with LIMIT. mysql_num_rows() returns the number of rows returned after LIMIT is applied. if you use the SQL_CALC_FOUND_ROWS keyword in your SELECT statement, then mysql_num_rows() returns the number of rows that would have been returned if LIMIT were not used. this is helpful for paging.