c) Explain, with examples, the meaning of the following OLAP terms (i) drill down,(ii) roll up,(iii) slice?(iv)pivot

(i) Drill down: In OLAP, drill down refers to the process of navigating from a higher level of data granularity to a lower level of detail. It involves accessing more specific or detailed information about a particular dimension or attribute. For example, if we have a sales report that shows total sales by region, we can drill down to see the sales by individual stores within each region.

(ii) Roll up: Roll up is the opposite of drill down. It involves summarizing or aggregating data from a lower level of detail to a higher level. It allows us to view data at a more general or summarized level. For instance, if we have a sales report that shows sales by individual stores, we can roll up the data to see the total sales for each region.

(iii) Slice: Slicing in OLAP refers to the process of selecting a subset of data from a multidimensional dataset based on specific criteria or conditions. It involves filtering the data to focus on a particular dimension or attribute. For example, if we have a sales report that includes data for multiple years, we can slice the data to view sales for a specific year or a range of years.

(iv) Pivot: In OLAP, pivoting refers to the process of reorganizing or reorienting the data to view it from a different perspective. It involves changing the arrangement of dimensions and measures to gain new insights or analyze the data from a different angle. For instance, if we have a sales report that shows sales by region and product category, we can pivot the data to view sales by product category and region instead.