Day 11. ETL, DB design and data profiling

In this video, we will delve into the topic of SQL ETL, which stands for Extract, Transform, Load. Specifically, we will focus on the process of designing a database structure for an ETL task and developing a mapping document for converting raw data into a usable format.

The video begins by discussing the importance of database structure design in an ETL task, highlighting key considerations such as data integrity and scalability.

Next, we shift our attention to the process of developing a mapping document, which is a critical step in the ETL process that involves specifying how raw data will be transformed and loaded into the target database. We will cover key aspects of a mapping document, such as source-to-target mapping, data transformation rules, and data validation and error handling.

Throughout the video, we will use practical examples and real-world scenarios to illustrate the concepts and techniques discussed, giving viewers a clear understanding of how to design an effective database structure and develop a mapping document for an ETL task.

There is a little bit of information about CSV file import methods and creating file of format description for raw data mapping.

SQL .fmt files, also known as format files, are files used in SQL Server to specify the format of data files that are being imported or exported. These files contain a set of instructions that define the layout of the data in the file, such as the field delimiter, row terminator, and data type for each column.

The purpose of .fmt files is to provide a way to specify the format of data files that may have a non-standard layout, such as those generated by legacy systems or third-party applications. By using a format file, users can customize the import or export process to match the specific layout of their data file, ensuring that the data is correctly parsed and processed by SQL Server.

The format file is then used to parse the data file and match the columns in the file to the corresponding columns in the destination table.