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REFERENTIAL INTEGRITY

REFERENTIAL INTEGRITY. CREATE TABLE EMP (ENAME VARCHAR(30) NOT NULL, ESSN CHAR(9), BDATE DATE, DNO INTEGER DEFAULT 1, SUPERSSN CHAR(9), PRIMARY KEY (ESSN), FOREIGN KEY (DNO) REFERENCES DEPT(Dnm) ON DELETE SET DEFAULT

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REFERENTIAL INTEGRITY

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  1. REFERENTIAL INTEGRITY CREATE TABLE EMP (ENAME VARCHAR(30) NOT NULL, ESSN CHAR(9), BDATE DATE, DNO INTEGER DEFAULT 1, SUPERSSN CHAR(9), PRIMARY KEY (ESSN), FOREIGN KEY (DNO) REFERENCES DEPT(Dnm) ON DELETE SET DEFAULT ON UPDATE CASCADE, FOREIGN KEY (SUPERSSN) REFERENCES EMP(ssn) ON DELETE SET NULL ON UPDATE CASCADE );

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