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sunil
Constraint Violating Yak Guru
282 Posts |
 Posted - 2005-12-29 : 04:17:53
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| Can we have a table that has primary key and foreign key with in itself.example-:We have a table employees and 2 fields EmpID and ManagerID.Here , EmpId is Primary Key and ManagerID is foreign Key.Can this be possible? If yes, How is Referential Integrity maintained here. |
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shallu1_gupta
Constraint Violating Yak Guru
394 Posts |
Posted - 2005-12-29 : 04:42:13
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| yes it is possible.ManagerId can either be null or can be the empId which exists in the table. ALTER TABLE <tableName> ADD CONSTRAINT <ConstraintName> FOREIGN KEY ( ManagerId) REFERENCES <TableName>(EmpId) |
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Foreign Key within same table?