DROP TABLE user_notification CASCADE CONSTRAINTS;
CREATE TABLE user_notification(
user_id  number (20,4) NOT NULL ,
registration_id varchar2(1024) NOT NULL,
ua_channel_id varchar2(1024) NOT NULL,
email_id varchar2(40) NOT NULL,
platform varchar2(10) NOT NULL,
user_name varchar2(40) NOT NULL,
push_notification_status varchar2(10) NOT NULL);

ALTER TABLE user_notification  ADD constraint PK_notification PRIMARY KEY (user_id);