A standalone function that you create with the CREATE FUNCTION statement differs from a function that you declare and define in a PL/SQL block or package. For more information, see "Function Declaration and Definition" and CREATE PACKAGE Statement

Similar to a procedure, a PL/SQL function is a reusable program unit stored as a schema object in the Oracle Database. The following illustrates the syntax for creating a function: RETURN return_type. IS . [declarative section] BEGIN . [executable section] [exception -handling section]

In the syntax diagrams for SQL functions, arguments are indicated by their datatypes. When the parameter function appears in SQL syntax, replace it with one of the functions described in this section. Functions are grouped by the datatypes of their arguments and their return values.

SQL functions are used exclusively with SQL commands within SQL statements. There are two general types of SQL functions: single row (or scalar) functions and aggregate functions. These two types differ in the number of database rows on which they act.

The syntax to create a function in Oracle is: CREATE [OR REPLACE] FUNCTION function_name [ (parameter [,parameter]) ] RETURN return_datatype IS | AS [declaration_section] BEGIN executable_section [EXCEPTION exception_section] END [function_name];

Jun 15, 2024 · To create a procedure in PL/SQL, use the CREATE FUNCTION statement. The syntax to create a function in PL/SQL is given below: (parameter_name type [, …]) In this example, we create a PL/SQL function to calculate factorial of a number. To call a function, specify the function name and any required parameters.

Aug 30, 2017 · In this example, we will create a function to check whether a given string is palindrome or not. A palindrome is a word, phrase, number, or other sequence of characters which reads the same backward as forward, such as madam or racecar.

Tutorial and How to use Oracle SQL Functions, Math, Character, Single Row, Aggregate Functions with examples

For easy reference, we have provided a list of all Oracle / PLSQL functions. The list of Oracle / PLSQL functions is sorted into the type of function based on categories such as string/character, conversion, advanced, numeric/mathematical, and date/time.

There are two types of functions in Oracle. 1) Single Row Functions: Single row or Scalar functions return a value for every row that is processed in a query. 2) Group Functions: These functions group the rows of data based on the values returned by the query. This is discussed in SQL GROUP Functions.