The following relational schema represents PRODUCT, SUPPLY, and SUPPLIER tables, where P# = Product Number, QTY = Quantity, S# = Supplier Number. SELL_PRICE in PRODUCT is the price of selling, while SUP_PRICE is the supplier-pnce supplied by the supplier. PRODUCT (P#, P_NAME, SELL PRICE, QTY) SUPPLY(S#*, P#*, SUP_PRICE) SUPPLIER(S#, CITY) The above contain an important error. What is it? Be specific. Explain.

1. the program must provide following functions to extract some statistics. note that the data_list parameter specified in these functions may be the same for all functions or different for different functions—that is your choice. a skeleton file is provided on mirmir. a) open_file()prompts the user to enter a year number for the data file. the program will check whether the year is between 1990 and 2015 (both inclusive). if year number is valid, the program will try to open data file with file name ‘year.txt’, where is the year. appropriate error message should be shown if the data file cannot be opened or if the year number is invalid. this function will loop until it receives proper input and successfully opens the file. it returns a file pointer and year. i. hint: use string concatenation to construct the file name b) read_file(fp)has one parameter, a file pointer read. this function returns a list of your choosing containing data you need for other parts of this project. c) find_average(data_list) takes a list of data (of some organization of your choosing) and returns the average salary. the function does not print anything. hints: i. this is not the average of the last column of data. it is not mathematically valid to find an average by finding the average of averages—for example, in this case there are many more in the lowest category than in the highest category. ii. how many wage earners are considered in finding the average (denominator)

In which phase does software coding and testing happen in the spiral model? the spiral model does not have a separate testing phase. both, software coding and testing occurs during the phase.

Using the list, you can select the number of photos that will appear on each slide. a. theme b. frame shape c. pictures in album d. picture layout