58.User-Defined Functions in SQL|Scalar,Inline Table-valued and Multi-Statement Table-Valued

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This Video contains In-depth coverage of User-Defined Functions in SQL|Scalar,Inline Table-valued and Multi-Statement Table-Valued. Covers all of the important queries and SQL commands. In this videos series, you'll learn how to read and write complex queries. Handle tricky SQL interview questions. Implement complex SQL queries and answer popular interview questions on SQL. These videos series will help to crack interviews and get jobs in SQL Developer, Database Developer, Data Engineer, Reporting Analyst, Data Analyst, Data Scientist, System Analyst, Power BI Developer, Tableau Developer, BI Developer, etc.
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User-Defined Functions

Like functions in programming languages, SQL Server user-defined functions are routines that accept parameters, perform an action, such as a complex calculation, and return the result of that action as a value. The return value can either be a single scalar value or a result set.


Why use user-defined functions?
They allow modular programming.

You can create the function once, store it in the database, and call it any number of times in your program. User-defined functions can be modified independently of the program source code.


They allow faster execution.

Similar to stored procedures, Transact-SQL user-defined functions reduce the compilation cost of Transact-SQL code by caching the plans and reusing them for repeated executions. This means the user-defined function does not need to be reparsed and reoptimized with each use resulting in much faster execution times.

CLR functions offer a significant performance advantage over Transact-SQL functions for computational tasks, string manipulation, and business logic. Transact-SQL functions are better suited for data-access intensive logic.





They can reduce network traffic.

An operation that filters data based on some complex constraint that cannot be expressed in a single scalar expression can be expressed as a function. The function can then be invoked in the WHERE clause to reduce the number of rows sent to the client.

Types of functions:
Scalar Function: User-defined scalar functions return a single data value of the type defined in the RETURNS clause. For an inline scalar function, the returned scalar value is the result of a single statement. For a multistatement scalar function, the function body can contain a series of Transact-SQL statements that return a single value. The return type can be any data type except text, text, image, cursor, and timestamp.

Inline Table-valued Function: The user-defined inline table-valued function returns a table variable as a result of actions performed by the function. The value of the table variable should be derived from a single SELECT statement.

Multi-Statement Table-Valued Function: The user-defined multi-statement table-valued function returns a table variable as a result of actions performed by the function. In this, a table variable must be explicitly declared and defined whose value can be derived from multiple SQL statements.
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