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HOW SHALL WE DIFFERENTIATE BETWEEN PRIMARY KEY AND FORIEGN
KEY?
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Answer Posted / manoj byregowda
Primary key- A column (or columns)in a table which makes every row in table unique. eg - EMPLOYEE table, EMPID is column which is unique.
Foreign Key - A column (or columns) in table Whose value References to primary key of another table OR ( A column which derives its value from another tables primary key.)
eg - EMP table EMPID is PK and DEPTNO is FK.
DEPT table DEPTID is pk.
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