Revision as of 00:01, 23 May 2024

Internal

Also see:

NULL

CREATE TABLE ...
( ...
  CONSTRAINT pk_someconstraint PRIMARY KEY (somecolumn)
);

CREATE TABLE ...
( ...
  eye_color CHAR(2) CHECK (eye_color IN ('BR', 'BL', 'GR')),
  ...
);

@@ Line 4: / Line 4: @@
 =<tt>NOT NULL</tt> Constraint=
+Also see: {{Internal|SQL#SQL_NULL|<tt>NULL</tt>}}
 =Primary Key Constraint=