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

The following works for MySQL, PostgreSQL, and the H2 database:

drop table ACCESSLEVELS;

create table ACCESSLEVELS(id int, name varchar(255));

insert into ACCESSLEVELS select * from (
select 0, 'admin' union
select 1, 'SEO' union
select 2, 'sales director' union
select 3, 'manager' union
select 4, 'REP'
) x where not exists(select * from ACCESSLEVELS);