In relational algebra, what does the "projection" operation do?a.It selects specific rows from a table.b.It combines two tables into one.c.It selects specific columns from a table.d.It performs a cross join between two tables.
Question
In relational algebra, what does the "projection" operation do?a.It selects specific rows from a table.b.It combines two tables into one.c.It selects specific columns from a table.d.It performs a cross join between two tables.
Solution
The "projection" operation in relational algebra selects specific columns from a table. So, the correct answer is c. It selects specific columns from a table.
Similar Questions
What does the projection operation in relational algebra do?a.Produces a new relation containing tuples that appear in both input relationsb.Retrieves specific rows from a relationc.Retrieves specific columns from a relationd.Combines tuples from two relations based on a common attribute
Relational Algebra is a __________ query language that takes two relations as input and produces another relation as an output of the query.a.Fundamentalb.Relationalc.Structurald.Procedural
What is relational algebra?Select one:a.The mathematical basis for SQLb.A language used to store data in a databasec.The translation of a query by an SQL compilerd.An informal way to describe how a database works
Which of the following is NOT an operation in relational algebra?SelectionProjectionInsertionJoinNext
Which of the following is NOT an operation in relational algebra?
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.