International Journal of Computer Science and Management Research (IJCSMR)
Now-a-day's data aggregations operations are utilized in real world aspects like finding average of temperatures, average growth ratios of shares etc. which are the operations helpful in decision making process. The authors can adopt the results because they perform the operations on recorded statistical data. In these continuous queries are used to identify the changes in time period or series of time observe the changes and perform the operations on time varying data to provide useful results to take the online decision making process. They use distributed query processing methods which divides the query into sub queries these sub queries will perform the operations in their boundaries, another aspect network data aggregators which works as data items.