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Er model

Er model

by Sajib Dhali -
Number of replies: 2
What is ER model explain Keys in ER with example?
In reply to Sajib Dhali

Re: Er model

by Renesa Bente Maula -
It is a high-level data model.
A key is an attribute in ER diagrams whose values are distinct for each individual entity in an entity set. For example for a student entity set Roll Number or Registration Number can be a key because these are unique for each student entity.
In reply to Sajib Dhali

Re: Er model

by Sweety Islam -

A primary key is used to ensure data in the specific column is unique. A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. It uniquely identifies a record in the relational database table. ... Only one primary key is allowed in a table.