11:24 a DB Lab Sheet 3.docx Computer Engineering Dept. Third Class DB Lab Sheet 3&4 Using RDBM, build the following DBS using all enhanced techniques acquired previously and then apply SQL statements listed below keep in mind that you are allowed to optimize all relation schemas: TRAIN (NAME, START, DEST) TICKET (PNRNO.,TRAIN_NO. START, DEST, FARE) PASSENGER (NAME, ADDRESS, PNRNO.) 1. List the names of passengers who are travelling from the start to the destination station of the train and their age bigger than 45. 2. List the names of passengers who have a return journey ticket and have used this same company during last year 3. Insert a new 501 train from Ankara to Baghdad and check train working schedule. 4. Cancel the ticket of passenger name ALEX and replace it with Ali. 5. Update tickets table and add class to its formula. 6. Delete from passenger start and destination after each working week