创建Sequences

1.创建Sequence，从1开始递增

CREATE SEQUENCE info_id_seq INCREMENT BY 1 MINVALUE 1 MAXVALUE 9223372036854775807 START
WITH 1 NO CYCLE;

2.创建函数，调用Sequenect，传递一个固定值进去，默认以17400000000000000+seq

CREATE OR REPLACE FUNCTION "test"."fn_info_getsequence" (num1 numeric)  RETURNS SETOF numeric
  VOLATILE
AS $body$
declare
 rlt_seq numeric;
begin

   if num1=174 then
    return query select  num1*10000000000000+00000000000000+nextval('info_id_seq');
else
    raise exception 'param "num1" is incorrect,please input 174';
end if;
return;

end;
$body$ LANGUAGE plpgsql

 3.查看

select nextval('info_id_seq')

select fn_info_getsequence(174)