I have three tables: - P(P#, Pname, Color, Weight) aka Parts
- S(S#, Sname, Status, City) aka Suppliers
I need to find all parts that are supplied by ALL suppliers in London.
So far, I have this: - select P#, Pname from P where P# in (select x.P# from SP x, sp y where x.S# in (select S# from S where City = 'London') and x.p# = y.p#)
However, that returns parts that are supplied by at least one supplier in London. I'm having trouble modifying it so that every supplier in London needs to carry the part.
Any help would be greatly appreciated.
1  702 
I have three tables:- P(P#, Pname, Color, Weight) aka Parts
- S(S#, Sname, Status, City) aka Suppliers
I need to find all parts that are supplied by ALL suppliers in London.
So far, I have this:
- select P#, Pname from P where P# in (select x.P# from SP x, sp y where x.S# in (select S# from S where City = 'London') and x.p# = y.p#)
However, that returns parts that are supplied by at least one supplier in London. I'm having trouble modifying it so that every supplier in London needs to carry the part.
Any help would be greatly appreciated.
Try This: -
-
SELECT P.* FROM
-
(SELECT SP.P# FROM SP WHERE SP.S# IN (SELECT S# FROM S WHERE CITY = 'LONDON')) y, P
-
WHERE P.P# = Y.P#
-
-
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