1. Write an ALTER TABLE statement that adds two new check constraints to the Invoices table of the AP schema. The first should allow (1) payment_date to be null only if payment_total is zero and (2) payment_date to be not null only if payment_total is greater than zero. The second constraint should prevent the sum of payment_total and credit_total from being greater than invoice_total.

Design a class tictactoe that: holds the following information about the game: two-dimensional array (3 by 3), and winner. add additional variables as needed. includes the functions to perform the various operations on objects. for example, function to print the board, getting the move, checking if move is valid, determining if there is a winner after each move. add additional operations as needed. includes constructor(s). write the functions of the class, and write a program that uses the class. the program should declare an object of type tictactoe. the program will create the board and store it in the array. the program will allow two players to play the tic-tac-toe game. after every valid move update the array, check if there is a winner. if there is no winner and no tie, then print the board again to continue.

How would you categorize the software that runs on mobile devices? break down these apps into at least three basic categories and give an example of each.

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