Scalar functions in SQL Server

A scalar function in SQL Server is a user-defined function that returns a single value (like int, string, or date).

CREATE FUNCTION dbo.GetSquare (@num INT)

RETURNS INT

AS

BEGIN

RETURN @num * @num

END

SELECT dbo.GetSquare(5); -- Output: 25

Used in SELECT, WHERE, etc., but may affect performance on large datasets since it runs row-by-row.

This scalar function is very useful for reusing processing logic, helping you avoid code repetition when you need to manipulate similar data in multiple places. Additionally, encapsulating logic in a separate function makes SQL statements clearer, retro bowl college, easier to read, and easier to maintain, especially in large or complex systems.

A scalar function in SQL Server is a user-defined function that accepts one or more parameters, performs operations, and returns a single value (such as a string, number, or date) as its result. It can be used in SELECT, WHERE, or any other clause where an expression is allowed.

CREATE FUNCTION dbo.GetFullName (@FirstName NVARCHAR(50), @LastName NVARCHAR(50))
RETURNS NVARCHAR(100)
AS
BEGIN
    RETURN @FirstName + ' ' + @LastName
END

--Usage
SELECT dbo.GetFullName('Imran', 'Ansari') AS FullName;
-- Output: Imran Ansari

Good Luck!