Steps involved in ETL
The first step is extraction. This step extracts data from different sources in various formats such as No SQL, relational database, XML, and flat files. They are then taken into the staging area. The second step is transformation here, a set of rules is applied to the data to convert it into a single format. The controls consist of filtering, cleaning, joining, splitting, and sorting. The final step is loading; the data is loaded in the data warehouse. You can load the data regularly to keep it updated.