A car rental company has a rentals table with columns car_ty…

A car rental company has a rentals table with columns car_type and days_rented. The operations team wants to know the longest rental period for each car type. Which SQL query should they use? SELECT car_type, MAX(days_rented) FROM rentals GROUP BY car_type SELECT car_type, days_rented FROM rentals ORDER BY days_rented DESC SELECT MAX(days_rented) FROM rentals SELECT car_type, SUM(days_rented) FROM rentals GROUP BY car_type Answer: SELECT car_type, MAX(days_rented) FROM rentals GROUP BY car_type Explanation: MAX(days_rented) finds the longest rental per car type when grouped accordingly. Simply ordering by days_rented shows all rentals but not summaries. A plain MAX(days_rented) gives the longest rental overall, not per type. SUM(days_rented) would calculate totals, not maximums.

Assume the file names.txt contains the following names: Bill…

Assume the file names.txt contains the following names: BillJaneStaceyWhat will be the output after the following code is executed? in_file = open(‘names.txt’, ‘r’) print(‘—– Header —–‘) for line in in_file:   print(line) print(‘—– Footer —–‘) in_file.close()

A hotel chain stores guest records in a guests table with co…

A hotel chain stores guest records in a guests table with columns for guest_id, full_name, email, and country. If a manager wants to view all the information for every guest, what query should be used? SELECT guest_id, full_name, email, country FROM guests SELECT * FROM guests SELECT ALL FROM guests SELECT everything FROM guests Answer: SELECT * FROM guests Explanation: The * wildcard selects all fields in the table. Listing all columns individually works but is less efficient. SQL does not use ALL or everything as valid keywords in this context.

Use the diagram of mitosis/meiosis stages to answer the ques…

Use the diagram of mitosis/meiosis stages to answer the questions below.  All of the cells are from the same species. a. Which cell is in anaphase of mitosis? b. Which arrow is pointing at a centromere? c. Which cell is in metaphase of meiosis II? j. Panel C shows one arrangement of the chromosomes.  How different gametes (ignoring crossing over) will be produced by all the possible arrangements of chromosomes given this number of chromosomes? e. Which arrow is pointing at only at the spindle? f. Which of the following lists below contains all diploid cells? g. Which stage best describes cell G? h. Cell after meiosis II is complete. i. Which box illustrates a pair of homologous chromosomes?