What is the function in SQL?

A function is a set of SQL statements that perform a specific task. Functions foster code reusability. If you have to repeatedly write large SQL scripts to perform the same task, you can create a function that performs that task. A function accepts inputs in the form of parameters and returns a value.

How do you write a function in SQL query?

Define the CREATE FUNCTION (scalar) statement:

1. Specify a name for the function.
2. Specify a name and data type for each input parameter.
3. Specify the RETURNS keyword and the data type of the scalar return value.
4. Specify the BEGIN keyword to introduce the function-body.
5. Specify the function body.
6. Specify the END keyword.

What are the built-in functions in SQL?

SQL Server has many built-in functions. This reference contains string, numeric, date, conversion, and some advanced functions in SQL Server.

What are the user defined functions in SQL?

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.

How do I open a function in SQL?

Using SQL Server Management Studio

1. In Object Explorer, click the plus sign next to the database that contains the function to which you want to view the properties, and then click the plus sign to expand the Programmability folder.
2. Click the plus sign to expand the Functions folder.

What are the basics of PL?

PL/SQL extends SQL by adding constructs found in procedural languages, resulting in a structural language that is more powerful than SQL. The basic unit in PL/SQL is a block. All PL/SQL programs are made up of blocks, which can be nested within each other. Typically, each block performs a logical action in the program.