A foreign key is a type of constraint. In this example the value in a field must be the same as some value in a defined field in another table.
Example in a Customer Table you might have a Column (field) named StatusID
You would define a foreign key to the table Status, field StatusID.
The value in the Customer table, StatusID column must be an entry existing in the Status Table, StatusID column.
There are many constraints. The fact that a column can not be NULL (Left blank) is a constraint. Defining what KIND of data, or range of data that can be entered in a column is a constraint.
Any Equality Constraint constraint in an LP problem is called Unrestricted Variable
Many to many relationship in DBMS is usually a mirror of the real-life relationship between objects that tables represent.
no diff between varchar and varchar2 char store only chacter type but varchar2 store variable chacters. also varchar2 shirinks the space if not fully filled but char cant.
Essbase is a multidimensional DBMS where Hyperion performance suite is a set of BI tools.
difference between relation sehema and relation instance in dbms
what do u mean by lossiess join in dbms
Binding constraint limits the value of the objective function.
limitation or restriction.
Primary key
overall design of the database
A DBMS kernal is a type of database. It is usually used in the architecture business world and it consists of software and system-level data structures.
Object-oriented DBMS
RDBMS,network,hirasrchy etc
Object oriented DBMS
NA_ what are highlights of advanced DBMS what are highlights of advanced DBMS what are highlights of advanced DBMS
A constraint which is not required or is extra, presence or absence of such a constraint does not effect the solution of problem
what is social design constraint