Prior to the introduction of AutoCAD, most commercial CAD programs ran on mainframe computers or minicomputers, with each CAD operator (user) working at a separate graphics terminal. AutoCAD is used across a wide range of industries, by architects, project managers, engineers, graphic designers, and other professionals. It is supported by 750 training centers worldwide as of 1994.
Aggregate Functions (Transact-SQL) Aggregate functions perform a calculation on a set of values and return a single value. Except for COUNT, aggregate functions ignore null values. Aggregate functions are frequently used with the GROUP BY clause of the SELECT statement. All aggregate functions are deterministic.
An Access database is a relational database contained in a single file that you can upload to a directory on your Web server. People typically create an Access database file using Microsoft Access or FrontPage. An Access database is different than SQL Server or MySQL database because it is a flat file that you upload on your hosting server. Many Web developers use Microsoft Access databases in conjunction with FrontPage Server Extensions.