Sql command for query
S(S#, SNAME, STATUS, CITY) PRIMARY KEY (S#)
P(P#, PNAME, COLOR, WEIGHT, CITY)PRIMARY KEY (P#)
J( J#, JNAME) PRIMARY KEY (J#)
SPJ( S#, P#, J#, QTY) PRIMARY KEY (S#,P#,J#)
ques) write a command to get supplier numbers for suppliers who supply the same part to all projects
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