CREATE TABLE statement

A CREATE TABLE statement creates a table. Tables contain columns and constraints, rules to which data must conform. Table-level constraints specify a column or columns. Columns have a data type and can specify column constraints (column-level constraints).

For information about constraints, see CONSTRAINT clause.

You can specify a default value for a column. A default value is the value to be inserted into a column if no other value is specified. If not explicitly specified, the default value of a column is NULL. See Column default.

You can specify storage properties such as page size for a table by calling the SYSCS_UTIL.SYSCS_SET_DATABASE_PROPERTY system procedure.

If a qualified table name is specified, the schema name cannot begin with SYS.

Syntax

CREATE TABLE table-Name
    ( {column-definition | Table-level constraint}
    [ , {column-definition | Table-level constraint} ] * )

Example

CREATE TABLE HOTELAVAILABILITY
     (HOTEL_ID INT NOT NULL, BOOKING_DATE DATE NOT NULL,
	ROOMS_TAKEN INT DEFAULT 0, PRIMARY KEY (HOTEL_ID, BOOKING_DATE));
-- the table-level primary key definition allows you to
-- include two columns in the primary key definition
PRIMARY KEY (hotel_id, booking_date))
-- assign an identity column attribute to an INTEGER
-- column, and also define a primary key constraint
-- on the column
CREATE TABLE PEOPLE
	(PERSON_ID INT NOT NULL GENERATED ALWAYS AS IDENTITY
	CONSTRAINT PEOPLE_PK PRIMARY KEY, PERSON VARCHAR(26));
-- assign an identity column attribute to a SMALLINT
-- column with an initial value of 5 and an increment value
-- of 5.
CREATE TABLE GROUPS
	(GROUP_ID SMALLINT NOT NULL GENERATED ALWAYS AS IDENTITY 
	(START WITH 5, INCREMENT BY 5), ADDRESS VARCHAR(100), PHONE VARCHAR(15));

Note: For more examples of CREATE TABLE statements using the various constraints, see CONSTRAINT clause.