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.
These two definitions of ETL are what make ELT a bit confusing. ELT is a different way of looking at the tool approach to data movement. Instead of transforming the data before itâs written, ELT leverages the target system to do the transformation. The data is copied to the target and then transformed in place.