Re-read what you've typed in that cell see if you typed it correctly.
He is using a Computer to type out the document, and a Printer for printing the document.
Thank you!
Answer:
Explanation:
A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table. A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table.
