Hi folks.
I've got a master detail relationship where I have a railway route table
listing landmarks along the route, and a Links table listing URL's
associated with that landmark. Listed below:
How can I do a query showing the landmark ID, the landmark name, and a count
of links associated with that landmark. Below is a SQL statement that
although is illegal, gives a good idea of what I'm looking for.
select r.rtid, r.rtname, l.count(*) from route r, links l where l.lktype = 'R'
and l.lklid = r.rtid;
nymr=# \d route Table "route"Attribute | Type |
Modifier
------------+-----------------------+--------------------------------------------------rtid | integer
| not null default
nextval('route_rtid_seq'::text)rtmile | integer | not nullrtyards | integer | not
nullrtname | character varying(40) |rtspeed | integer |rtgradient | integer
|rtsection | integer |rtphone | character(1) |rtcomments | text |
Indices: route_index, route_rtid_key
nymr=# select r.rtid, l.count(*) from route r, links l where
nymr=# \d links Table "links"Attribute | Type |
Modifier
-----------+-----------------------+-------------------------------------------------lkid | integer
|not null default
nextval('staff_sid_seq'::text)lkdesc | character varying(40) |lkurl | character varying(40) |lktype |
character(1) |lklid | integer |
Index: links_lkid_key
lktype indicates the link type - 'R' indicates a route entry
lklid indicates the link ID. For a 'R' it is the rtid of the route entry
--
Gary Stainburn
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