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.
(For more info, see A Beginnerâs Guide to SQL Aggregate Functions.) We can use GROUP BY with any of the above functions. For instance, we use the MIN() function in the example below: This would retrieve the minimum value found in âcolumn_nameâ for each set of values in a group based on the âgroup_columnâ column.