Relational Algebra SQL join example?

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Problem Statement:-

I was going through relational algebra tutorial. I was wondering how would I write relational algebra query with a SQL JOIN query. I am facing a lot of problem on this-

Below is the question and its SQL query as well-

1) Find an Id of the Employee who has taken IT or BUSINESS training.

    SELECT DISTINCT EmployeeID FROM Outcome O JOIN Training T ON T.TrainingCode = O.TrainingCode WHERE T.TrainingName = 'IT' OR T.TrainingName = 'BUSINESS';

2) Find the Id of employee who has taken every training.

    SELECT X.EmployeeID
    FROM (SELECT EmployeeID, COUNT(*) AS NumClassesTaken FROM OutCome GROUP BY EmployeeID ) AS X
    JOIN 
	(SELECT COUNT(*) AS ClassesAvailable FROM Training) AS Y
    ON X.NumClassesTaken = Y.ClassesAvailable;

What will be Relational Algebra example for the above two? Can anyone help me with this?