In the world of data engineering, ETL (Extract, Transform, Load) is a key process that allows you to efficiently extract data from various sources, transform it into a suitable format for analysis, and then load it into a target database or data warehouse. This blog will guide you through the ETL process using SQL, with code examples applicable to Oracle and other relational databases such as MySQL, PostgreSQL, and SQL Server. What is ETL? ETL stands for Extract, Transform, Load , which refers to the three key steps involved in moving data from one system to another, typically from source databases to a data warehouse. Here’s a breakdown: Extract : This step involves retrieving data from source systems such as relational databases, flat files, APIs, or cloud services. Transform : The extracted data often needs to be cleaned, formatted, aggregated, or enriched to meet the specific needs of the destination system or analytics process. Load : Finally, the transformed data is l...
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