A primary key is a candidate key that is most appropriate to be the main reference key for the table. As its name suggests, it is the primary key of reference for the table and is used throughout the database to help establish relationships with other tables.
1 A concrete driveway with several decorative elements can cost $12 -$18 a square foot, or $3,600 -$5,400 for 12'x25' or $11,500 -$17,500 for 24'x40'.
PRICE PER SQUARE FOOT: $3.25 to $5.25 (for plain concrete depending on the size and complexity). Decorative Concrete Costs: 1  Decorative Concrete Cost. 2  Stamped Concrete Cost.3  Stained Concrete Price. 4  Concrete Driveway Cost. 5  Concrete Patio Cost. 6  Walkway Cost.ecorative options such as stamping (see stamped concrete cost), staining (see stained concrete cost), and special finishes will add significantly to the cost of the project. For plain concrete, you can expect your price to fall somewhere between $3.25 and $5.25 square foot depending on the project size and complexity.