How to calculate real wages?

How to calculate contractor wages base on this pl/sql statement ??? the following is the script?

• CREATE OR REPLACE FUNCTION DECLARE BEGIN -- execution SELECT SUM(skills_price*No_hrs+NVL(comm,0)) -- the NVL means function lets you substitute a value when a null value is encountered, hence it will later convert NULL value to zero '0' FROM Skills, Daily_Work WHERE (StartDate IS NOT NULL AND FinishDate IS NOT NULL); -- exception END; / can u guide me how to create an effective pl/sql contractor wages script ?? pls advice me or provide some hints for my logic thinking , pls feel free to help terima kasih (thank you )

• Answer:

  Sorry I only know Python, C++ and Java not sql... maybe i might learn it next year. Im only in my 2nd year of my computer science degree. Good luck though!