H2 SQL database - INSERT if the record does not exist

Question

I would like initialize a H2 database, but I am not sure if the records exist. If they exist I don\'t want to do anything, but if they don\'t exist I would like to write the

Answer 1

MERGE INTO ACCESSLEVELS 
  KEY(ID) 
VALUES (0, 'admin'),
  (1, 'SEO'),
  (2, 'sales director'),
  (3, 'manager'),
  (4, 'REP');

Updates existing rows, and insert rows that don't exist. If no key column is specified, the primary key columns are used to find the row.