His reign of 72 years and 110 days is the longest of any monarch of a major country in European history. In this age of absolutism in Europe, Louis XIV's France was a leader in the growing centralization of power.
If you omit the GROUP BY clause, then Oracle applies aggregate functions in the select list to all the rows in the queried table or view. You use aggregate functions in the HAVING clause to eliminate groups from the output based on the results of the aggregate functions, rather than on the values of the individual rows of the queried table or view.
Adding in the IF Function. By combining either of these two functions with the IF function, the capabilities of both functions is increased. Example â Nesting the AND and OR functions inside an IF function. Nesting functions in Excel refers to placing one function inside another. The nested function acts as one of the main function's arguments. In the image above, cells B5 and B6 contain IF functions with a nested AND function (cell B5) and a nested OR function (cell B6).