Create a table called Wars that will contain fields name, starting date, ending date (where applicable), cause, and combatants (as a single column). Identify its primary key and appropriately constrain the table such that the wars cannot have an ending date beyond the current date and that the wars that you care about start after year 0. Also I need a table of Nations that will be used to help further constrain the table. It should contain a name, a starting date, and an ending date of the country (where applicable). Again, constrain the ending date such that it is less than or equal to the current date.