Select subquery CHECK constraint DB2
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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
asked Nov 24 at 19:33
user2251234
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up vote
1
down vote
favorite
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
asked Nov 24 at 19:33
user2251234
82
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
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
asked Nov 24 at 19:33
user2251234
82
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
db2 constraint
asked Nov 24 at 19:33
user2251234
82
asked Nov 24 at 19:33
user2251234
82
asked Nov 24 at 19:33
user2251234
82
asked Nov 24 at 19:33
user2251234
82
asked Nov 24 at 19:33
user2251234
82
82
add a comment |
add a comment |
1 Answer
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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.
answered Nov 24 at 20:03
mustaccio
8,88562135
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
5
down vote
accepted
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.
answered Nov 24 at 20:03
mustaccio
8,88562135
add a comment |
up vote
5
down vote
accepted
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.
answered Nov 24 at 20:03
mustaccio
8,88562135
add a comment |
up vote
5
down vote
accepted
up vote
5
down vote
accepted
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.
answered Nov 24 at 20:03
mustaccio
8,88562135
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.
answered Nov 24 at 20:03
mustaccio
8,88562135
edited Nov 25 at 14:17
answered Nov 24 at 20:03
mustaccio
8,88562135
answered Nov 24 at 20:03
mustaccio
8,88562135
answered Nov 24 at 20:03
mustaccio
8,88562135
8,88562135
add a comment |
add a comment |
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