Using variable declaration options : Declare Variable « Postgre SQL « PostgreSQL

1. PostgreSQL
2. Postgre SQL
3. Declare Variable

Using variable declaration options

postgres=# -- Using variable declaration options
postgres=#
postgres=# CREATE FUNCTION example_function () RETURNS text AS '
postgres'#   DECLARE
postgres'#
postgres'#     -- Declare a constant integer with a default value of 5.
postgres'#     five CONSTANT INTEGER := 5;
postgres'#
postgres'#     -- Declare an integer with a default value of 100 that cannot be NULL.
postgres'#     ten INTEGER NOT NULL := 10;
postgres'#
postgres'#     -- Declare a character with a default value of "a".
postgres'#     letter CHAR DEFAULT ''a'';
postgres'#
postgres'#   BEGIN
postgres'#   return letter;
postgres'#   END;
postgres'# ' LANGUAGE 'plpgsql';
CREATE FUNCTION
postgres=#
postgres=# select example_function ();
 example_function
------------------
 a
(1 row)

postgres=#
postgres=# drop function example_function ();
DROP FUNCTION
postgres=#
postgres=#
           
       

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