Functions creation in sql
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This document discusses functions in SQL Server. It defines a function as reusable block of code that performs a specific task and can return a single value. There are two types of functions: system-defined functions like scalar and aggregate; and user-defined functions like scalar, inline table-valued, and multi-statement table-valued. Scalar functions return a single value, while table-valued functions return an entire table. The document provides examples of each type of function.
Functions creation in sql
- 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
- 3. TOPIC Function creation in SQL Server
- 4. What is Function A function is a set of Instruction that performs a specified task, which Repeatedly occur in the main Program.
- 5. • A Function is also Stored Block of code similar to a Procedure. • A Function is a Block of Code which will return only a single value. • A Function can be used in a Select Statement. • Try and Catch Statements cannot be used in the Functions.
- 6. Types of Function • 1) System Defined Function • 2) User Defined Function
- 7. 1) System Defined Function These functions are defined by Sql Server for different purpose. We have two types of system defined function in Sql Server - Scalar Function Scalar functions operates on a single value and returns a single value. - Aggregate Function Aggregate functions operates on a collection of values and returns a single value.
- 8. 2) User Defined Function These functions are created by user in system database or in user defined database. three types of user defined functions. - Scalar Function User defined scalar function also returns single value as a result of actions perform by function.
- 10. • Inline Table-Valued Function User defined inline table-valued function returns a table variable as a result of actions perform by function. The value of table variable should be derived from a single SELECT statement.
- 12. • Multi-Statement Table-Valued Function User defined multi-statement table-valued function returns a table variable as a result of actions perform by function. In this a table variable must be explicitly declared and defined whose value can be derived from a multiple sql statements
- 15. THE END Create by Shafi
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