0 votes 0 votes Can a tuple in unary-relationship set be in relation with itself. For example, take a tuple T1 in an entity E1 and this entity E1 is related to itself. Now can the Tuple T1 be in relation to tuple T1 ? OneZero asked Jan 16, 2019 OneZero 222 views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply gauravkc commented Jan 16, 2019 reply Follow Share I think you are talking about self referencing relationship. Say we have a relation Employee. Say a manager manages few employees. But, for company, a manager is also an employee. So the relation will have both managers and employees. And the self referencing relationship will be manages. 0 votes 0 votes OneZero commented Jan 16, 2019 reply Follow Share Sorry my bad. Let me frame my question in a better manner Consider you have a person Ram. Say we have a table called PQR which contains Ram, now my doubt was can we have a relation between person Ram in PQR table to Ram himself (not another person named Ram but the Ram mentioned before )itself considering the relation is unitary relationship set 0 votes 0 votes Shaik Masthan commented Jan 16, 2019 reply Follow Share if you want referencing, then name should be unique/primary key. Let it is Primary Key, then also directly can't you insert the data. One way is:- First insert the data and then Apply the foreign Key concept Alternative :- First keep it with Some Dummy value, later update it ! ( i didn't study it anywhere, it's my opinion ) 0 votes 0 votes Please log in or register to add a comment.