How many values in an “in” clause is too many in a SQL query?

Question

I have a SQL query that uses the values of an array in its WHERE clause:

 $ids = array 
         ( 
           [0] => 1 
           [1] => 2 
           [2         


        

Answer 1

The more values you put into IN, the slower it will run, obviously.

"how many is too many" is a function of many factors. For example, your dataset size. Or how the rest of your query looks like.