I am using oracle sql developer to insert rows in my database.
While this request is working :
INSERT INTO TABLE ( USERID, USERNAME) VALUES (1,\"ok1\
Oracle does not support multi-row inserts. You need to write one insert per row:
INSERT INTO TABLE ( USERID, USERNAME) VALUES (1,'ok1');
INSERT INTO TABLE ( USERID, USERNAME) VALUES (2,'ok2');
Additionally: string literals need to be enclosed in single quotes in SQL. Double quotes are for identifiers. "ok1" is a column name, 'ok1' is a string constant.