Select subquery CHECK constraint DB2












1














I have 2 tables: TVSHOW and ACTOR. I want to reject records if the inserted actor in TVSHOW does not exist in the ACTOR table using DB2.



db2 "ALTER TABLE TVSHOW ADD CONSTRAINT check_actor CHECK (actor in (select id from ACTOR))"


I keep running into, During SQL processing it returned: SQL0546N The check constraint "check_actor" is invalid.



How can I fix this?










share|improve this question



























    1














    I have 2 tables: TVSHOW and ACTOR. I want to reject records if the inserted actor in TVSHOW does not exist in the ACTOR table using DB2.



    db2 "ALTER TABLE TVSHOW ADD CONSTRAINT check_actor CHECK (actor in (select id from ACTOR))"


    I keep running into, During SQL processing it returned: SQL0546N The check constraint "check_actor" is invalid.



    How can I fix this?










    share|improve this question

























      1












      1








      1







      I have 2 tables: TVSHOW and ACTOR. I want to reject records if the inserted actor in TVSHOW does not exist in the ACTOR table using DB2.



      db2 "ALTER TABLE TVSHOW ADD CONSTRAINT check_actor CHECK (actor in (select id from ACTOR))"


      I keep running into, During SQL processing it returned: SQL0546N The check constraint "check_actor" is invalid.



      How can I fix this?










      share|improve this question













      I have 2 tables: TVSHOW and ACTOR. I want to reject records if the inserted actor in TVSHOW does not exist in the ACTOR table using DB2.



      db2 "ALTER TABLE TVSHOW ADD CONSTRAINT check_actor CHECK (actor in (select id from ACTOR))"


      I keep running into, During SQL processing it returned: SQL0546N The check constraint "check_actor" is invalid.



      How can I fix this?







      db2 constraint






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 24 at 19:33









      user2251234

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          You cannot use a subselect in a check constraint; you can only reference columns from the same table.



          However, what you want to accomplish is what referential integrity constraints, also known as foreign keys, are for.



          ALTER TABLE TVSHOW ADD CONSTRAINT actor_fk FOREIGN KEY (actor) REFERENCES ACTOR(id)


          Presumably you have already defined a primary key constraint on ACTOR.id; if not, you need to define it, or a unique constraint on that column.






          share|improve this answer























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            1 Answer
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            active

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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            5














            You cannot use a subselect in a check constraint; you can only reference columns from the same table.



            However, what you want to accomplish is what referential integrity constraints, also known as foreign keys, are for.



            ALTER TABLE TVSHOW ADD CONSTRAINT actor_fk FOREIGN KEY (actor) REFERENCES ACTOR(id)


            Presumably you have already defined a primary key constraint on ACTOR.id; if not, you need to define it, or a unique constraint on that column.






            share|improve this answer




























              5














              You cannot use a subselect in a check constraint; you can only reference columns from the same table.



              However, what you want to accomplish is what referential integrity constraints, also known as foreign keys, are for.



              ALTER TABLE TVSHOW ADD CONSTRAINT actor_fk FOREIGN KEY (actor) REFERENCES ACTOR(id)


              Presumably you have already defined a primary key constraint on ACTOR.id; if not, you need to define it, or a unique constraint on that column.






              share|improve this answer


























                5












                5








                5






                You cannot use a subselect in a check constraint; you can only reference columns from the same table.



                However, what you want to accomplish is what referential integrity constraints, also known as foreign keys, are for.



                ALTER TABLE TVSHOW ADD CONSTRAINT actor_fk FOREIGN KEY (actor) REFERENCES ACTOR(id)


                Presumably you have already defined a primary key constraint on ACTOR.id; if not, you need to define it, or a unique constraint on that column.






                share|improve this answer














                You cannot use a subselect in a check constraint; you can only reference columns from the same table.



                However, what you want to accomplish is what referential integrity constraints, also known as foreign keys, are for.



                ALTER TABLE TVSHOW ADD CONSTRAINT actor_fk FOREIGN KEY (actor) REFERENCES ACTOR(id)


                Presumably you have already defined a primary key constraint on ACTOR.id; if not, you need to define it, or a unique constraint on that column.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Nov 25 at 14:17

























                answered Nov 24 at 20:03









                mustaccio

                8,95162136




                8,95162136






























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