How can a stored procedure be called from PL/SQL?

A stored procedure in PL/SQL can be called from a block of code, another procedure or a trigger. Here are the steps to do it:

1. Declare the stored procedure: Before you can call a procedure, it must be declared and defined in the database. This is typically done using the CREATE PROCEDURE statement.

CREATE PROCEDURE procedure_name [(parameter_name [type [, ...]])] AS
  -- procedure body
BEGIN
  -- SQL statements
END;

2. Call the stored procedure: Once the procedure is declared, you can call it from a PL/SQL block, another procedure, or a trigger using the EXECUTE statement or simply the procedure name.

BEGIN
  procedure_name [(parameter_value [, ...])];
END;

or

EXECUTE procedure_name [(parameter_value [, ...])];

3. Pass parameters to the stored procedure: If the stored procedure accepts parameters, you can pass them in the call. The parameters must be passed in the same order as they are declared in the procedure.

BEGIN
  procedure_name (parameter_value1, parameter_value2, ...);
END;

4. Handle the procedure result: If the stored procedure returns a result, you can handle it in the calling code. This is typically done using a variable that is assigned the result of the procedure call.

DECLARE
  result_variable type;
BEGIN
  result_variable := procedure_name (parameter_value1, parameter_value2, ...);
  -- handle result_variable
END;

Remember to replace procedure_name, parameter_name, type, parameter_value and result_variable with your actual procedure name, parameter names, their types, parameter values and result variable respectively.