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.
SQL Aggregate functions. Discussion in 'SQL PL/SQL' started by SBH, Oct 16, 2010. The article explains the Aggregate functions in SQL. 1. Apart from the single row functions like CONCAT, SUBSTR, INSTR, NVL and others, Oracle provides Aggregate functions also. Unlike single Row SQL functions, Aggregate functions operate on GROUPS. They are not data manipulation functions but derive and produce additional information from the selected columns.