H2用random()选择LIMIT和OFFSET

Question

在h2 dbms中，我有一个表

CREATE TABLE sometable
( ID INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY,
  somevalue INTEGER)

和一些数据

INSERT INTO sometable(somevalue) 
VALUES (1), (2), (3), (4), (5);

当I SELECT somevalue FROM sometable LIMIT 1 OFFSET 2 工作。为什么如果我想选择随机行SELECT somevalue FROM sometable LIMIT 1 OFFSET (RANDOM()*4) 不工作?

Answer 1

你可以这样做:

create table test(
  id bigint auto_increment primary key, 
  name varchar(255));
insert into test 
select x, 'Hello ' || x from system_range(50, 1200);
select * from test t, system_range(1, 100) range
where t.id = x * (select max(id)-min(id) from test) / 100 + 
(select min(id) from test);

源