Breast cancer may cause swollen axillary lymph nodes since the lymph vessels of the breast drain into the lymph nodes of the armpit. These nodes become enlarged when cancer cells spread beyond the breast tissue.
Relational database. (Redirected from Database constraints) A relational database is a digital database whose organization is based on the relational model of data, as proposed by E. F. Codd in 1970. The various software systems used to maintain relational databases are known as a relational database management system (RDBMS).
A constraint is a limit or restriction. Hopefully your school won't cut the sports or music programs due to budget constraints! You might notice that constraint is similar to the verb constrict, as in boa constrictor. A constraint tightens around you like a snake and prevents you from doing what you want. Financial constraints prevent you from buying the latest electronic device.