Archive for August 18th, 2009
Passing parameters in MySQL: IN list vs. temporary table
When you need to pass a list of parameters into a MySQL, there are at least two method to do this:
- Issue a dynamical query which would fill an
INlist with constant values - Fill a temporary table with these values then use it in a
JOIN
The second method is considered better for many reasons (you can easily reuse the values, it's more injection-proof etc.)
Leaving all these issues aside, let's compare these methods performance-wise.
We will create a table of 50,000 records, pass a list of 500 parameters (using both methods) and see which is faster:
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