remove 'DROP TABLE IF EXISTS' for db schema
remove 'DROP TABLE IF EXISTS' for db schema

TalkingData/OWL-v3,TalkingData/OWL-v3,TalkingData/OWL-v3,TalkingData/owl,TalkingData/OWL-v3,TalkingData/owl,TalkingData/OWL-v3,TalkingData/owl