Therefore, it is important that every single record in a database has something to uniquely identify it and this is called the 'Primary Key' or sometimes the 'Key Field'. When you started school, you were given a 'student ID' or an 'office number' (primary key).
Ignoring any maintenance costs, asphalt is generally much cheaper to install than concrete. On average, the cost per square foot for asphalt will run between $2.50 to $4.00. Fluctuations in crude oil prices can cause fluctuations in asphalt prices but the price will remain around this range. Concrete, on the other hand, can run between $4.00 to $6.00 per square foot for basic installation and can cost more depending on different finishes and detail. Itâs not unheard of to have a stained concrete driveway with a smooth finish cost over $15.00 per square foot.
0. The average cost to lay concrete per square foot is about $4. Prices have gone high in the past few years due to the inflation. The cost to lay concrete in the USA used to be between $1.5-$2.5 but these days it is near $4.5 or even as high as $5.It also depends on the person to whom you are giving the job for concrete.. The average cost to lay concrete per square foot is about $4. Prices have gone high in the past few years due to the inflation. The cost to lay concrete in the USA used to be between $1.5-$2.5 but these days it is near $4.5 or even as high as $5.