extract transform load etl certification

Below are some key applications of ETL in Business Intelligence: ETL plays a pivotal role in enabling effective BI by providing the necessary data integration, transformation, and loading capabilities. How is ETL used in business intelligence applications?īusiness Intelligence (BI) is the process of transforming raw data into meaningful insights to support strategic decision-making within an organization. In this way, the data can be compared and the obsolete information can be specifically deleted. This is often done using a unique ID or by entering the time at which the information was saved. If there is already older information of the same type there, this must be supplemented accordingly or even exchanged. The data we prepared in the previous steps can now be loaded into the data warehouse or the target database. This could include, for example, that the turnover is already aggregated on a daily basis and not each order is saved individually if this is required. In addition, basic calculations are already made here with which the data can be summarized or prepared. This includes, for example, filling in missing values or correcting errors. If there are still data quality problems, these are now processed. In this stage, all data is transformed into a structure that matches the data model of the data warehouse or the application. The Extract step involves loading information from a wide variety of sources.

If there are no or only a few deficiencies, the data is passed to the next stage, where the necessary changes are made. If the data has gross quality defects, it can also be rejected at this stage. For example, checks could be made to see if all items that represent a price are also marked in USD. These checks can include, for example, matching the data type or looking for missing values. In this step, among other things, data quality checks are performed to ensure a clean state in the data warehouse. To better understand the Extract, Transform, Load process, it is worthwhile to look at the individual phases in detail: ETL ExtractĮxtraction is the process step in which data is retrieved from various sources and stored centrally. Extract, Transform, Load Process | Source: Author What are the ETL Process Steps?

Extract transform load etl certification