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.
A database shard is a horizontal partition of data in a database or search engine. Each individual partition is referred to as a shard or database shard.Each shard is held on a separate database server instance, to spread load. Some data within a database remains present in all shards, but some only appears in a single shard. Each shard (or server) acts as the single source for this subset of data.ach shard is held on a separate database server instance, to spread load. Some data within a database remains present in all shards, but some only appears in a single shard. Each shard (or server) acts as the single source for this subset of data.