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 database is in essence one or multiple computer files that encode data in a highly structured format. A database management system (DBMS) is the category of computer software programs used for creating, organizing, retrieving, analyzing, and sorting information in computer-based databases.Such software is often informally referred to as database software..ATABASE MANAGEMENT SYSTEMS. Photo by: Nmedia. A database is a collection of data (or facts) that are logically organized and can easily be searched or manipulated. The term database nearly always refers to such a collection in electronic form, which is stored on and can be searched by computer.