Table creation

Table creation
You are encouraged to solve this task according to the task description, using any language you may know.

In this task, the goal is to create a table to exemplify most commonly used data types and options.

PostgreSQL

-- This is a comment

CREATE SEQUENCE account_seq start 100;
CREATE TABLE account (
  account_id  int4 PRIMARY KEY DEFAULT nextval('account_seq'),
  created     date not null default now(),
  active      bool not null default 't',
  username    varchar(16) unique not null,
  age         int2,
  notes       text
);

CREATE TABLE account_note (
  account_id  int4 not null REFERENCES account,
  created     timestamp not null default now(),
  note        text not null,
  unique(account_id, note)
);