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Fastest way to check if anything is in a MySQL tableFastest way to check if anything is in a MySQL table
Submitted by Benjamin Melançon on December 18, 2007 - 7:54pm
http://forums.mysql.com/read.php?101,50600,50853#msg-50853
Vail wrote:
> When it checks to see if the
> group exists, however, and the table is empty, it
> always returns an error, which disables the script
> that calls the function.Why not doing a simple
select count(*) from groups
?
This tells you directly how many groups you have and will always return a valid value.
Mike
Mike Lischke, Software Engineer GUI
MySQL AB, www.mysql.com
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mysql fastest way to check for rows in table
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Comments
Long thread on count speed
http://www.mysqlperformanceblog.com/2007/04/10/count-vs-countcol/
Faster way
SELECT 1 FROM
tableLIMIT 1;This is imho the fastest way to find out, if the table is empty, no counting, just stop at first match - if it finds a line, it returns a constant of 1, otherwise, empty result.
Cool, thanks!
Didn't know you could just do "SELECT 1" like that. Very nice!
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