Blood counting machines aspirate a very small amount of the specimen through narrow tubing followed by an aperture and a laser flow cell. Laser eye sensors count the number of cells passing through the aperature, and can identify them; this is flow cytometry.
In computing, Extract, Transform and Load (ETL) refers to a process in database usage and especially in data warehousing that performs: Data extraction â extracts data from homogeneous or heterogeneous data sources.
Using ETL software to extract, transform, and load data directly into a data warehouse or mart. Transparently drilling and joining data warehouses to operational data. Using an operational systems' (e.g., SAP) own application functions to access data.