Relation

What is Relation?

Definition and meaning of Relation

Relation is now and again used to consult a Table in a Relational Database however is extra usually used to explain the Relationships that can be created between those tables in a relational Database.

In relational Databases, a courting exists among two tables while one among them has a Foreign Key that references the Primary Key of the other table. This single reality lets in relational databases to split and shop Records in special tables, but nonetheless Hyperlink the disparate statistics items collectively. It is one of the Functions that Makes relational databases such powerful and green shops of facts.

The Capacity to outline relationships is so essential and so vital that that is what differentiates relational databases from different sorts of databases, which include flat-File databases. Relation, consequently, is the defining Characteristic of relational databases.

Relation may also be referred to as relationship.

What Does Relation Mean?

Consider a bank’s database. You have a CUSTOMER_MASTER table that stores customer statistics, with a primary key column referred to as CustID, in addition to an ACCOUNTS_MASTER table for containing data approximately numerous financial institution bills and which patron owns them. To hyperlink those tables collectively, that is to tie every customer to his or her financial institution account, a corresponding CustID column is needed in the ACCOUNTS_MASTER desk that references an already-existing patron ID inside the CUSTOMER_MASTER table. In this case, the CustID column in ACCOUNTS_MASTER is a overseas key that references the column of the equal name in CUSTOMER_MASTER. This State of affairs refers back to the relation between the two tables.

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