unable to call a function

[giozh <giozh@xxxxxxxx>]

i've write this function that search if inside a specified table there's a
specified value:

CREATE FUNCTION check_if_if_exist(id INTEGER, table_name character(50),
table_column character(20) ) RETURNS BOOLEAN AS $$

BEGIN 
	RETURN EXECUTE 'SELECT EXISTS(SELECT * FROM table_name WHERE table_column =
id)';
END;

$$ LANGUAGE plpgsql

but when i try to call it i always receive an error and the function will
not call. where is the problem?



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