system used to maintain relational databases is a relational database management system (RDBMS). Many relational database systems are equipped with the option...

Carrier's constraint on lung function in long thin animals Finite domain constraint, in mathematical solution-finding Integrity constraints in databases Check...

and tables (relations) of a database to ensure that their dependencies are properly enforced by database integrity constraints. It is accomplished by applying...

to police this constraint. Many database systems require that both referencing and referenced sets of columns in a FOREIGN KEY constraint are indexed, thus...

is normally enforced in a database system by a series of integrity constraints or rules. Three types of integrity constraints are an inherent part of the...

integrity constraints imposed on a database.[citation needed] These integrity constraints ensure compatibility between parts of the schema. All constraints are...

important for databases that might be used for a long time (perhaps several decades). This has made the idea and implementation of relational databases very popular...

very small number of constraints. There is always at least one constraint, and TOC uses a focusing process to identify the constraint and restructure the...

DBMS, the database system or an application associated with the database. Small databases can be stored on a file system, while large databases are hosted...

Constraint programming (CP) is a paradigm for solving combinatorial problems that draws on a wide range of techniques from artificial intelligence, computer...

immediately visible. Relational databases are traditionally composed of tables with fixed-size fields and records. Object databases comprise variable-sized blobs...

tables. In the context of relational databases, a foreign key is subject to an inclusion dependency constraint that the tuples consisting of the foreign...

Foundations of Databases. Addison-Wesley. pp. 192–199. Microsoft Support (2007-02-11). "Error message 1785 occurs when you create a FOREIGN KEY constraint that...

check constraint is a type of integrity constraint in SQL which specifies a requirement that must be met by each row in a database table. The constraint must...

problems in other areas such as finite model theory and databases. Establishing whether a constraint satisfaction problem on a finite domain has solutions...

allowed ways. Any data written to the database must be valid according to all defined rules, including constraints, cascades, triggers, and any combination...

SQL-like query languages or sit alongside SQL databases in polyglot-persistent architectures. Non-relational databases have existed since the late 1960s, but...

intelligence and operations research, constraint satisfaction is the process of finding a solution through a set of constraints that impose conditions that the...

database that are not clear domain or key constraints. Most databases can easily test domain and key constraints on attributes. General constraints however...

lie in the fields of database theory—comprising work on deductive databases, object-oriented databases, and constraint databases—as well as in fault-tolerant...

graph databases, making them useful for heavily inter-connected data. Graph databases are commonly referred to as a NoSQL database. Graph databases are...

language for OLAP databases; N1QL is a Couchbase's query language finding data in Couchbase Servers; Object Query Language OCL (Object Constraint Language)....

In database theory, a multivalued dependency is a full constraint between two sets of attributes in a relation. In contrast to the functional dependency...

definition: PRIMARY KEY ( [comma separated column list] ) Constraints: {CONSTRAINT} [constraint definition] RDBMS specific functionality An example statement...

multiple noncontiguous databases with a single query—even if the constituent databases are heterogeneous. To this end, a federated database system must be able...

activity. Spatiotemporal databases are an extension of spatial databases and temporal databases. A spatiotemporal database embodies spatial, temporal...

The enforcement of a key constraint (i.e. a uniqueness constraint) in a table is also a data integrity feature of the database. The DBMS prevents updates...

model of relational databases by introducing an open-world assumption into it. The closed world assumption, as it pertains to databases, states that "Everything...

programming. Object databases are different from relational databases which are table-oriented. A third type, object–relational databases, is a hybrid of...

In the relational model of databases, a primary key is a designated attribute (column) that can reliably identify and distinguish between each individual...