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barcode generator project source code in vb.net Operator + * / Description Addition Subtraction Multiplication Division in Software
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Basic SQL Functions
A function is a special type of program that returns a single value each time it is invoked. The term comes from the mathematical concept of a function. In SQL, functions always require an expression, which often includes the name of a column. Functions are most often used in the column list of the SELECT statement and are invoked for each row processed by the query and therefore return a single value for each row that appears in the result set. Sometimes the term column function is used to remind you that the function is being applied to a table or view column. A number of functions are provided by the DBMS vendor, and in most SQL implementations, you can write your own using a special language that comes with the DBMS, such as PL/SQL for Oracle, or Transact SQL for Microsoft SQL Server and Sybase Adaptive Server. Functions can be categorized in many ways, but most people categorize them by the type of work that they perform. The most common functions are described here, but as always, check your DBMS documentation it s likely that it provides more functions than the ones covered in this book. The categories used in this book are character, mathematical, conversion, and aggregate, and each category has its own sections.

