MySQL CONCAT returns NULL if any field contain NULL

I have following data in my table "devices" affiliate_name affiliate_location model ip os_type os_version cs1 inter Dell 10.125.103.25 Linux Fedora cs2 inter Dell 10.125.103.26 Linux Fedora cs3 inter Dell 10.125.103.27 NULL NULL cs4 inter Dell 10.125.103.28 NULL NULL I executed below query SELECT CONCAT(`affiliate_name`,'-',`model`,'-',`ip`,'-',`os_type`,'-',`os_version`) AS device_name FROM devices It returns result given below cs1-Dell-10.125.103.25-Linux-Fedora cs2-Dell-10.125.103.26-Linux-Fedora (NULL) (NULL) How to come out of this so that it should ignore NULL AND result should be cs1-Dell-10.125.103.25-Linux-Fedora cs2-Dell-10.125.103.26-Linux-Fedora cs3-Dell-10.125.103.27- cs4-Dell-10.125.103.28-