Referential Integrity
Broschiertes Buch

Referential Integrity

Versandkostenfrei!
Versandfertig in 6-10 Tagen
22,99 €
inkl. MwSt.
PAYBACK Punkte
11 °P sammeln!
High Quality Content by WIKIPEDIA articles! Referential integrity is a property of data which, when satisfied, requires every value of one attribute (column) of a relation (table) to exist as a value of another attribute in a different (or the same) relation (table). Less formally, and in relational databases: For referential integrity to hold, any field in a table that is declared a foreign key can contain only values from a parent table's primary key or a candidate key. For instance, deleting a record that contains a value referred to by a foreign key in another table would break referential...