Dynamically create a mysql select query

Hi, I need a mysql query dynamically generated from post data. This is the table structure of the table which needs to be queried: c_id tag_id 1 1 1 2 2 1 The post data prints like this: [tags] => Array ( [param] => all [value] => Array ( [0] => 1 [0] => 2 ) ) The value array above is the array of tag_id and is chosen from a multiple select list so any number of tag_id's can be in that array. The query i would need to create based on the post data above would need to select any contact (c_id) which is assigned to both tag 1 and tag 2. In the case of the table above c_id 1 would be selected but not c_id 2. The basic query used to select this is SELECT c1.c_id FROM tag_table c1 JOIN tag_table c2 on c1.c_id = c2.c_id WHERE c1.tag_id = 1 AND c2.tag_id = 2 However I need this to be generated dynamically. Thanks Paul