How can I set a size limit for an “int” datatype in PostgreSQL 9.5

Question

I am experimenting with PostgreSQL coming from SQL using MySQL and I simply wish to create a table with this piece of code which is valid SQL:

CREATE TABLE f         


        

Answer 1

The answer is that you use numeric or decimal types. These are documented here.

Note that these types can take an optional precision argument, but you don't want that. So:

CREATE TABLE flat_10
(
  pk_flat_id DECIMAL(30) DEFAULT 1,
  rooms      DECIMAL(10) NOT NULL,
  room_label CHAR(1) NOT NULL,

  PRIMARY KEY (pk_flat_id)
);

Here is a SQL Fiddle.

I don't think that Postgres supports unsigned decimals. And, it seems like you really want serial types for your keys and the long number of digits is superfluous.