Extract transfer loading [ETL] testing includes the testing of the ETL tool which we are using for the Extract transfer loading and test of the data ie data warehouse, any data base or data which we extract on real time.
ETL testing includes :
Testing of the tool: Various features of the tool
Testing of the scripts:In case we are using the scripts in the ETL to extract transfer and load data
Database testing: Testing of the data through the ETL tool or Sql, oracle queries