Issue adding foreign key

[George Woodring]

I have 2 existing tables in my db:

iss=> \d pollgrpinfo
Table "public.pollgrp info"
Column | Type | Modifiers
---------------+------------------------+-----------
pollgrpinfoid | integer | not null
pollgrpid | integer | not null
name | character varying(100) |
descript | character varying(200) |
Indexes:
"pollgrpinfo_pk ey" primary key, btree (pollgrpinfoid)
"pollgrpinfo_po llgrpid_key" unique, btree (pollgrpid)

iss=> \d notpoll
Table "public.notpoll "
Column | Type | Modifiers
-------------+------------------------+---------------------
notpollid | integer | not null
pollgrpid | integer |
notgroupsid | integer |
alerting | character(1) | default 'y'::bpchar
disuser | character varying(50) |
distime | integer |
alertingcom | character varying(200) |
Indexes:
"notpoll_pk ey" primary key, btree (notpollid)
"notpoll_pollgr pid_key" unique, btree (pollgrpid)
"notpoll_alerti ng_index" btree (alerting)
Triggers:
"RI_ConstraintT rigger_2110326" AFTER INSERT OR UPDATE ON notpoll
FROM notgroups NOT DEFERRABLE INITIALLY IMMEDIATE FOR EACH ROW EXECUTE
PROCEDURE "RI_FKey_check_ ins"('notgroups _exists', 'notpoll',
'notgroups', 'UNSPECIFIED', 'notgroupsid', 'notgroupsid')

I am trying to add a foreign key to the notpoll table

iss=> alter table notpoll add constraint pollgrp_exists foreign
key(pollgrpid) references pollgrpinfo on delete cascade;
ERROR: insert or update on table "notpoll" violates foreign key
constraint "pollgrp_exists "
DETAIL: Key (pollgrpid)=(76 85) is not present in table "pollgrpinf o".

I have verified that the information is in the pollgrpinfo table:

iss=> select * from pollgrpinfo where pollgrpid=7685;
pollgrpinfoid | pollgrpid | name | descript
---------------+-----------+------+----------
767 | 7685 | HTTP |
(1 row)


I could use a suggestion on how to proceed in troubleshooting the error
message. I am running 7.4.5

Thanks,
Woody

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[Edmund Bacon]

Re: Issue adding foreign key

george.woodring @iglass.net ("George Woodring") writes:
[color=blue]
> I have 2 existing tables in my db:
>
> iss=> \d pollgrpinfo
> Table "public.pollgrp info"
> Column | Type | Modifiers
> ---------------+------------------------+-----------
> pollgrpinfoid | integer | not null
> pollgrpid | integer | not null
> name | character varying(100) |
> descript | character varying(200) |
> Indexes:
> "pollgrpinfo_pk ey" primary key, btree (pollgrpinfoid)
> "pollgrpinfo_po llgrpid_key" unique, btree (pollgrpid)
>
> iss=> \d notpoll
> Table "public.notpoll "
> Column | Type | Modifiers
> -------------+------------------------+---------------------
> notpollid | integer | not null
> pollgrpid | integer |
> notgroupsid | integer |
> alerting | character(1) | default 'y'::bpchar
> disuser | character varying(50) |
> distime | integer |
> alertingcom | character varying(200) |
> Indexes:
> "notpoll_pk ey" primary key, btree (notpollid)
> "notpoll_pollgr pid_key" unique, btree (pollgrpid)
> "notpoll_alerti ng_index" btree (alerting)
> Triggers:
> "RI_ConstraintT rigger_2110326" AFTER INSERT OR UPDATE ON notpoll
> FROM notgroups NOT DEFERRABLE INITIALLY IMMEDIATE FOR EACH ROW EXECUTE
> PROCEDURE "RI_FKey_check_ ins"('notgroups _exists', 'notpoll',
> 'notgroups', 'UNSPECIFIED', 'notgroupsid', 'notgroupsid')
>
> I am trying to add a foreign key to the notpoll table
>
> iss=> alter table notpoll add constraint pollgrp_exists foreign
> key(pollgrpid) references pollgrpinfo on delete cascade;
> ERROR: insert or update on table "notpoll" violates foreign key
> constraint "pollgrp_exists "
> DETAIL: Key (pollgrpid)=(76 85) is not present in table "pollgrpinf o".
>[/color]

When expressed as "FOREIGN KEY (foo) REFERENCES mytable" postgresql
assumes that foo references the PRIMARY KEY for table mytable. If you
are not referencing the primary key, you need to tell postgresql which
column e.g. FOREIGN KEY (foo) REFERNCES mytable(foo).


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