We are dropping Func_Test function.When developing in T-SQL on SQL Server, I sometimes need to update or process multiple rows at once. We are changing owner of the Func_Test function from postgres to test user. We can call or execute Func_Test by using the following command are as follows. We have used pl/pgsql language to create a new function. 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 PostgreSQL functionīelow is an example of create new function.
It uses an interface that defines an argument and return type of function, as we have stated in the function’s syntax. If we do not define the language at the time of function creation, it will choose the default language. We can implement it in different languages. This command is used to display all function from a database. We can check all function from the database by using a “\df”. It is used to execute several queries in one function and return the result as the same that was written in the function. It is nothing but a set of SQL statements that were stored on a database server and invoked after using a SQL interface. Before the version 11 function, it is essential to act as a PostgreSQL procedure after PostgreSQL version 11 function and procedure are differentiated. This language is used to create new function in it. We create a new function in many languages like 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 created in the database. PostgreSQL stored procedure or function is set in SQL statements or in PL/SQL statements. PostgreSQL functions are also called as a stored procedure or stored function in PostgreSQL. Attribute: This will display extra information of a function. Definition: This parameter defines a definition of a function. Configuration parameter: This defines as a configuration parameter set as a different value. Result rows: Result of rows that have returned from the function. Rows: Rows parameter defines as total rows returned from the function. Cost: The cost parameter define the execution cost of function. Execution cost: This parameter defines as the total time required to execute the function it shows the positive number. Window: This defines as we are creating a window function instead of a plain function. The language can be python, pl/pgsql or C. Language name: This is defined as the name of the language we have used to create a function. 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: Default states that if we not given any argument, it will take the default.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 function, 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)[ Hadoop, Data Science, Statistics & othersĬREATE FUNCTION
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