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).
Any good SQL Server database will use constraints and other DRI in order to maintain integrity and increase performance. The violation of any constraints leads to an error, and it is rare to see this handled well. Autocommit transaction mode. Letâs create a table that allows us to be able to make a couple of different constraint violations. Youâll have to imagine that this is a part of a contact database that is full of constraints and triggers that will defend against bad data ever reaching the database. Naturally, there will be more in this table.