How to call function in postgresql using casting?

@shyann 

To call a function in PostgreSQL using casting, you can follow these steps:

1. First, create a function in PostgreSQL. Here is an example of a simple function that adds two integers:

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CREATE FUNCTION add_numbers(a integer, b integer) RETURNS integer AS $$
BEGIN
    RETURN a + b;
END;
$$ LANGUAGE plpgsql;

1. Next, you can call this function using casting by specifying the datatype for the function parameters. Here is an example of how to call the add_numbers function using casting:

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SELECT add_numbers(5::integer, 10::integer);

In this example, 5::integer and 10::integer are used to explicitly cast the parameters to integers before passing them to the add_numbers function.

1. The function will return the result of adding the two integers, which in this case is 15.

By using casting, you can ensure that the function parameters are of the correct datatype before calling the function.