How to return clause in findall/3

From: rhapsody (blurrynight_at_yahoo.com)
Date: 08/12/04 

Date: Wed, 11 Aug 2004 21:58:12 -0400

Hi, I am new to Prolog. What is the correct way of returning a list of
clauses 'sc/3' to the variable X? Below is my codes:
Database
sc(symbol Sid,symbol Cid, integer ExamScore).

Clauses
sc("S1","C1",55).
sc("S1","C2",60).
sc("S1","C3",70).
Goal
findall(sc(),sc(X,_,_),List), X="S1", write(List), nl.

Thanks in advance!
Stanly

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