面试题与答案

ETL (Extract, Transform, Load) testing is a process of verifying the correctness of data transformation and loading from source to target databases.

Example:

An example of ETL testing is validating that data from a CSV file is accurately transformed and loaded into a data warehouse.

A staging area in ETL is an intermediate storage area where data is temporarily held during the extraction and transformation processes before being loaded into the target data warehouse.

Example:

Data extracted from source systems is first loaded into the staging area, where it undergoes transformations before being moved to the final data warehouse.