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RandFreeman (talk | contribs) Importing Wikidata short description: "Function provided by the user of a program or environment" |
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In the [[COBOL]] programming language, a user-defined function is an entity that is defined by the user by specifying a FUNCTION-ID paragraph. A user-defined function must return a value by specifying the RETURNING phrase of the procedure division header and they are invoked using the function-identifier syntax. See the ISO/IEC 1989:2014 Programming Language COBOL standard for details.
As of May 2022, the IBM Enterprise COBOL for [[z/OS]] 6.4 ([[IBM COBOL]]) compiler contains support for user-defined functions.
==Databases==
In [[relational database management system]]s, a user-defined function provides a mechanism for extending the functionality of the [[database server]] by adding a function, that can be evaluated in standard [[query language]] (usually [[SQL]]) statements. The [[ISO/IEC 9075|SQL standard]] distinguishes between [[Scalar (computing)|scalar]] and table functions. A scalar function returns only a single value (or [[null (SQL)|NULL]]), whereas a table function returns a (relational) table comprising zero or more rows, each row with one or more columns.
User-defined functions in SQL are declared using the <code>CREATE FUNCTION</code> statement. For example, a user-defined function that converts Celsius to Fahrenheit (a temperature scale used in USA) might be declared like this:
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Data type supported in Microsoft SQL Server 2000
Like a temporary table used to store results
Mostly used to define [[temporary variable]] of type (table) and the return value of a UDF
The scope is limited to function, stored procedure, or batch in which it is defined
Assignment operation is not allowed between (Table) variables
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