What are SQL functions in SQL Server?

Posted on by Muna Meyer

What are SQL functions in SQL Server?

Functions in SQL Server are the database objects that contains a set of SQL statements to perform a specific task. A function accepts input parameters, perform actions, and then return the result. We should note that functions always return either a single value or a table.

Does SQL Server have functions?

SQL Server Functions A SQL Server function is a code snippet that can be executed on a SQL Server. Functions can be used anywhere in SQL, like AVG, COUNT, SUM, MIN, DATE and so on with select statements. Functions compile every time. Functions must return a value or result.

How can I see the functions in SQL Server?

To show a user-defined function’s properties

  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 different SQL functions?

SQL Functions

  • AVG() – Returns the average value.
  • COUNT() – Returns the number of rows.
  • FIRST() – Returns the first value.
  • LAST() – Returns the last value.
  • MAX() – Returns the largest value.
  • MIN() – Returns the smallest value.
  • SUM() – Returns the sum.

How do I see all functions in SQL?

To get the list of all the functions in a database, you can use the transact SQL statement against the system objects like Sys….Find All User Defined Functions Using Transact-SQL

  1. Using Sys. objects.
  2. Using Information_Schema. Routines.
  3. Using Syscomments.
  4. Using Sys.

What is function in SQL Server with example?

SQL Server Advanced Functions

Function Description
CAST Converts a value (of any type) into a specified datatype
COALESCE Returns the first non-null value in a list
CONVERT Converts a value (of any type) into a specified datatype
CURRENT_USER Returns the name of the current user in the SQL Server database

How do I create a SQL Server Function?

SQL Server Function Types. SQL Server supports two types of functions – user-defined and system.

  • User-Defined Functions. In this type of function,we select a table data using a user-created function.
  • System function. This function is used for inserting records and is a system built-in function.

    • How to check if a function exists in SQL Server?

    – Table-valued Function – Scalar-valued Function – Aggregate Function

    What are the basics of SQL Server?

    – Principals: Entities that can be authenticated to access the SQL Server resources. – Securables: SQL Server resources that can be accessed by a principal. – Permissions: Types of access granted on a securable to a specific principal.

    What is the role of a SQL Server?

    User logs into the application,and the application connects to SQL Server,identifying itself as the user

  • The application executes the sp_setapprole stored procedure using the application-specific password
  • If role name and password are valid,the application role is enabled