Database Management System a In relational algebra what are

Database Management System

a. In relational algebra, what are the 2 symbols that allow me to return some of the columns and some of the rows from a set.

b. In SQL _______________ is the key word for saying what attributes are returned from a set.

Solution

a. projection symbol (i.e ) is used to select columns in the table

selection synbol (i.e sigma) is used to select rows or records in table

b. select keyword is used to say what attributes are returned from a set