Answers for "plpgsql print error message if condition is true"

postgres raise notice

RAISE INFO 'Hello World !';
RAISE NOTICE '%', variable_name;
RAISE NOTICE 'Current value of parameter (%)', my_var;
RAISE EXCEPTION '% cannot have null salary', EmpName;

raise notice in postgresql function

RAISE INFO 'Hello World !';
RAISE NOTICE '%', variable_name;
RAISE NOTICE 'Current value of parameter (%)', my_var;
RAISE EXCEPTION '% cannot have null salary', EmpName;