Database: Tables: Table Commands

CREATE TABLE table-name (col-def,... [, tbl-constraint,...] )

col-def	::= column-name data-type [DEFAULT value] [col-constraint...]
col-constraint	::= [constraint-name] {      [NOT] NULL    | PRIMARY KEY    | REFERENCES table-name [(col-name,...)] [delupd-action]    | UNIQUE    | DEFAULT value    | CHECK (search-condition) }
tbl-constraint	::= PRIMARY KEY (col-name,...)    | FOREIGN KEY (col-name,...)          REFERENCES table-name [(col-name,...)] [delupd-action]    | CHECK (search-condition)    | UNIQUE (col-name,...)
delupd-action	::= [ON UPDATE ref-action] [ON DELETE ref-action]
ref-action	::= CASCADE    | SET NULL    | SET DEFAULT    | NO ACTION -- also called RESTRICT
constraint-name	::= CONSTRAINT name

ALTER TABLE table-name alteration

alteration

::= ADD [COLUMN] col-def    | DROP [COLUMN] col-name [CASCADE | RESTRICT]    | ALTER [COLUMN] col-name          {SET DEFAULT value | DROP DEFAULT}    | ADD {CONSTRAINT name | constraint-def}    | DROP CONSTRAINT name {CASCADE | RESTRICT}

Note: An added column can not be NOT NULL without a SET DEFAULT value.

DROP TABLE table-name [CASCADE | RESTRICT]

Deletes the table. If CASCADE is specified, all objects referring to the table (eg, views) are also dropped. RESTRICT doesn't allow the drop if there are references to the table.