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).
Weâll see about RDBMS later in this article. Database management system is the means of controlling databases either in the hard disk in a desktop system or on a network. Database management system is used for creating database, maintained database and provides the means of using the database.DBMS doesnât consider relationship between the tables.atabase management system is the means of controlling databases either in the hard disk in a desktop system or on a network. Database management system is used for creating database, maintained database and provides the means of using the database. DBMS doesnât consider relationship between the tables.