Table creation

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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

Postgres developers, please feel free to add additional data-types you commonly use to this example.

-- 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,
  balance     float       default 0,
  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)
); 

-- bool:       't', 'f' or NULL
-- int2:       -32768 to  32767
-- int4:       -2147483648 to  2147483647
-- float:      decimal
-- date:       obvious
-- timestamp:  date time
-- char(#):    space padded text field with length of #
-- varchar(#): variable length text field up to #
-- text:       not limited