Database Management systems question

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Question 2 Use the tables (Courses and Lessons) below and the employees table in question 1. Write SQL to answer the following questions. 2.1 Provide the course code and description for any courses having a four-day duration (2 Marks) 2.2 Which courses have been held in JHB and/or in Pretoria? (3 Marks) 2.3 Which employees took both the JAV and the DATA courses? (5 Marks) 2.4 Print a list of all workers who did not attend the JAV training. (5 Marks) [Sub Total 15 Marks] Lessons Attendant Subject 2001 DATA JAV 2002 2003 DATA JAV Courses Code Description Duration Campus DATA Database 4 days JHB management systems JAV Java script 7 days Midrand MATH Mathematics 4 days Pretoria ISY Information 3 days Pretoria systems HTML Hyper Text 4 days JHB Markup Language PMT Project 7 days Midrand management 2004 JAV DATA MATH 2005 2006 2007 PMT ISY Oracle databases use structured query language (SQL) for writing and querying data. Consider the Table 1 below: Table 1: Employees eld sname Init job dept dob Office location 2001 Stones S Admin HR 3-12-1980 JHB 2002 Johnson K Salesrep Sales 12-4-1991 Midrand 2003 Nkosi F Manager Accounting 4-6-1978 Pretoria 2004 Dludla H Trainer Training 20-6-1985 JHB 2005 Dlamini J Manager HR 7-9-1976 Pretoria 2006 Pale K Admin HR 16-3-1997 Midrand 2007 Peter M Trainer Training 14-4-1969 JHB Use the above information and write SQL queries to answer the following questions