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FOREIGN KEY PRIMARY KEY FOREIGN KEY（Sno） REFERENCES S FOREIGN KEY（Pno） REFERENCES P
PRIMARY KEY (Sno) REFERENCE S (Sno)，FOREIGN KEY (Pno) REFERENCES P (Pno)
FOREIGN KEY (Sno) REFERENCE S (Sno)，PRIMARY KEY (Pno) REFERENCES P (Pno)
FOREIGN KEY (Sno) REFERENCE S (Sno)，FOREIGN KEY (Pno) REFERENCES P (Pno)
PRIMARY KEY (Sno) REFERENCE S (Sno)，PRIMARY KEY (Pno) REFERENCES P (Pno)
EXISTS NOTEXISTS IN NOT IN
SPZ.Sno=SPY.Sno AND SPZ.Pno=SPY.Pno SPZ.Sno=SPX.Sno AND SPZ.Pno=SPX.Pno SPZ.Sno=SPX.Sno AND SPZ.Pno=SPY.Pno SPY.Sno=′168′ AND SPZ.Pno=SPY.Pno
FOREIGN KEY PRIMARY KEY FOREIGN KEY（Sno） REFERENCES S FOREIGN KEY（Pno） REFERENCES P
FOREIGN KEY PRIMARY KEY FOREIGN KEY（Sno） REFERENCES S FOREIGN KEY（Pno） REFERENCES P
FOREIGN KEY PRIMARY KEY FOREIGN KEY（Sno） REFERENCES S FOREIGN KEY（Pno） REFERENCES P
FOREIGN KEY PRIMARY KEY FOREIGN KEY（Sno） REFERENCES S FOREIGN KEY（Pno） REFERENCES P
FOREIGN KEY PRIMARY KEY FOREIGN KEY（Sno） REFERENCES S FOREIGN KEY（Pno） REFERENCES P
FOREIGN KEY PRIMARY KEY FOREIGN KEY（Sno） REFERENCES S FOREIGN KEY（Pno） REFERENCES P
S(u)∧SP(v) ∧P(w) SP(u) ∧S(v) ∧P(w) P(u) ∧SP(v) ∧S(w) S(u) ∧P(v) ∧SP(w)
EXISTS NOT EXISTS IN NOT IN
FOREIGN KEY PRIMARY KEY FOREIGN KEY（Sno） REFERENCES S FOREIGN KEY（Pno） REFERENCES P
EXISTS NOT EXISTS IN NOT IN
FOREIGN KEY PRIMARY KEY FOREIGN KEY（Sno） REFERENCES S FOREIGN KEY（Pno） REFERENCES P
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