How to select a subset of results from a select statement
- by Ankur
I have a table that stores RDF triples:
triples(triple_id, sub_id, pre_id, obj_id)
The method (I need to write) will receive an array of numbers which correspond to pre_id values. I want to select all sub_id values that have a corresponding pre_id for all the pre_ids in the array that is passed in.
E.g. if I had a single pre_id values passed in... lets call the value passed in preId, I would do:
select sub_id from triples where pre_id=preId;
However since I have mutliple pre_id values I want to keep iterating through the pre_id values and only keep the sub_id values corresponding to the "triples" records that have both.
E.g. image there are five records:
triples(1, 34,65,23)
triples(2, 31,35,28)
triples(3, 32,32,19)
triples(4, 12,65,28)
triples(5, 76,32,34)
If I pass in an array of pre_id values [65,32] then I want to select the first, third, fourth and fifth records.
What would I do for that?
