PostgreSQL Documentation 16 CREATE FUNCTION
Description CREATE FUNCTION defines a new function CREATE OR REPLACE FUNCTION will either create a new function or replace an existing definition To be able to define a function the user must have the USAGE privilege on the language If a schema name is included then the function is created in the specified schema
Sql Declare a variable in a PostgreSQL query Stack Overflow, This solution is based on the one proposed by fei0x but it has the advantages that there is no need to join the value list of constants in the query and constants can be easily listed at the start of the query It also works in recursive queries Basically every constant is a single value table declared in a WITH clause which can then be called anywhere in the remaining part of the query
PostgreSQL Documentation 16 43 3 Declarations
All variables used in a block must be declared in the declarations section of the block The only exceptions are that the loop variable of a FOR loop iterating over a range of integer values is automatically declared as an integer variable and likewise the loop variable of a FOR loop iterating over a cursor s result is automatically declared as a record variable
PostgreSQL Documentation 16 DECLARE, Notes Normal cursors return data in text format the same as a SELECT would produce The BINARY option specifies that the cursor should return data in binary format This reduces conversion effort for both the server and client at the cost of more programmer effort to deal with platform dependent binary data formats
38 5 Query Language SQL Functions PostgreSQL
38 5 Query Language SQL Functions PostgreSQL, 38 5 9 SQL Functions Returning Sets When an SQL function is declared as returning SETOF sometype the function s final query is executed to completion and each row it outputs is returned as an element of the result set This feature is normally used when calling the function in the FROM clause
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Create a function declaring a predefined text array
Create a function declaring a predefined text array 21 I need to create a function in Postgres and one of the variables I declare is a predefined text array but I don t know the syntax to set its values This is what I have so far CREATE OR REPLACE FUNCTION testFunction RETURNS text AS DECLARE TESTARRAY TEXT value 1 value 2 value 3 BEGIN return any text END LANGUAGE
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PL pgSQL can be used to define trigger functions on data changes or database events A trigger function is created with the CREATE FUNCTION command declaring it as a function with no arguments and a return type of trigger for data change triggers or event trigger for database event triggers Special local variables named TG something are automatically defined to describe the condition PostgreSQL Documentation 16 43 10 Trigger Functions. CREATE OR REPLACE FUNCTION totalbalance RETURNS numeric AS DECLARE tmp RECORD result numeric BEGIN result 0 00 FOR tmp IN SELECT FROM foo LOOP result result tmp f1 END LOOP RETURN result END LANGUAGE plpgsql SELECT totalbalance totalbalance PostgreSQL Functions PostgreSQL functions also known as Stored Procedures allow you to carry out operations that would normally take several queries and round trips in a single function within the database Functions allow database reuse as other applications can interact directly with your stored procedures instead of a middle tier or
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