Hi
Please help me compose the query in PostgreSQL.
Using PostgreSQL 7.1.2.
Suppose relations A and B have columns: {X1, X2, ..., Xm, Y1, Y2, ..., Yn}
and {Y1, Y2, ..., Yn}
Attributes Y1, Y2, ..., Yn are common for both relations
and have the same type in both.
How can I define in PostgreSQL the query producing
relation with columns X1,X2,...,Xm containing all those tuples
satisfying conditon: relation A contains tupple {x1,x2,...xm,y1,y2,...,yn}
for _each_ tupple {y1,y2,...,yn}
in relation B ? Where x1 denotes particular value of
colum X1 etc.
For example: consider two tables DEND and DOR.
DEND DOR
s | p p
----+---- ---- s1 | p1 p1 s1 | p2 p2 s1 | p3 p3 s1 | p4 p4 s1 | p5 p5 s1 | p6 p5
s2| p1 (6 rows)s2 | p2s3 | p2s4 | p2s4 | p4s4 | p5
(12 rows)
For such tables our desired query should return:
s
----s1
Thanks in advance.
--
Vladimir Zolotych gsmith@eurocom.od.ua