In the above example, we have created a function name as Func_Test. Given below is the example to create, modify and drop a function: Example #1: Create a PostgreSQL functionīelow is an example of create a new function.Ĭode: CREATE OR REPLACE FUNCTION Func_Test () It uses an interface that defines an argument and return function type, as stated in the function’s syntax.It will choose the default language if we do not define the language during function creation. We can implement it in different languages.This command is used to display all functions from a database. We can check all functions from the database by using a “\df”.In PostgreSQL, we use a function to execute multiple SQL queries and return the results in the format specified in the function definition.In PostgreSQL, a stored procedure or function refers to a set of SQL statements stored on the database server and invoked through a SQL interface.However, starting from version 11, functions and procedures are distinguished from each other. Prior to version 11, a function in PostgreSQL was required to behave like a PostgreSQL procedure.To define a new function in PostgreSQL, we use the CREATE statement. In PostgreSQL, we can create a new function in various languages such as C, Python, SQL, and PL/pgSQL.Create a statement is used in a function to create a new function also, we can replace the existing function using replace keyword at the time of new function creation.Its name will be unique means it will not be the same as other names of a function that have already been created in the database.A PostgreSQL stored procedure or function consists of a set of SQL statements or PL/SQL statements.In PostgreSQL, people also refer to functions as stored procedures or stored functions.Attribute: This will display extra information about a function.Definition: This parameter defines a definition of a function.Configuration parameter: This defines a configuration parameter set as a different value.Result rows: Result of rows that have returned from the function.Rows: Rows parameter defines as the total rows returned from the function.Cost: The cost parameter define the execution cost of the function.Execution cost: This parameter defines the total time required to execute the function it shows the positive number.Window: This defines as creating a window function instead of a plain one.The language can be Python, pl/pgsql, or C.
Language name: We define the language used to create a function by specifying its name.Column type: This defines as a data type of column that we have returned in the return table syntax.Column name: This defines that the name of columns that we have a return in return table syntax.Table: Table name which column we have returned from a function.The return type can be anything composite, base, or table column. Rettype: This defines as a return type of functions.Default: The default behavior is to use a default value if no argument is given.Argtype: Type of argument which we have used to create a function.Argname: Name of argument which we have used to create a function.Argmode: Mode of argument which we have used in a function, the default argument mode of function is IN.Replace: Replace the function name which is already present in the database.Function name: Name of function which we are creating.) ] (Display optional function information)īelow is the parameter description of the above syntax: | AS 'definition' (Definition of function)
Name (Name of function) ( argtype (Type of argument)[ Below given is the syntax: CREATE FUNCTION
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