How do I create a Constraint in FireBird

I am writing a progam that converts MySQL database into a FireBird database... what is the SQL code (isql) to create a Constraint on a table?
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JoshWegenerAsked:
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Nick UpsonPrincipal Operations EngineerCommented:
a trigger looks like this (artwork is the name of the table)

CREATE TRIGGER ARTWORK_I FOR ARTWORK
ACTIVE BEFORE INSERT POSITION 0
AS

begin
IF ((new.artwork_u is NULL) OR (new.artwork_u < 1)) THEN
  new.artwork_u = gen_id(gen_artwork, 1);

end

a constraint is on a field in the table

CREATE TABLE ARTWORK (
       ARTWORK_U INTEGER NOT NULL,
       DATE_SUBMITTED TIMESTAMP NOT NULL,
       DATE_RETURNED TIMESTAMP,
      CONSTRAINT ARTWORK_PK PRIMARY KEY (ARTWORK_U)
);
0
JoshWegenerAuthor Commented:
I need a FK Constraint
0
Nick UpsonPrincipal Operations EngineerCommented:
ALTER TABLE EMPLOYEE ADD CONSTRAINT EMPLOYEE_FK1 FOREIGN KEY (JOBDESC) REFERENCES JOBDESC(JOBDESC_U);
0

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