From a table, the table contains a set of rows. In the figure, each row contains information about one student. Each column of the table describes the student in a particular way. In the example, the columns are Id, Name, Address and Status.
•A relation is a set of tuples. Following the example of the table STUDENT, we might define a relation called STUDENT containing the tuple (1111111, John Doe, 123 Main St., Freshman)is true.
•The tuples of relations correspondence to the rows of a table, and the column names of the table are the names of attributes of the relation.