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normalized relations
Tables, Entities, Attributes, Primary Keys, and Foreign Keys
Primary Key is a Constraint Used to avoid Duplicate entries in database table and you define primary key the column doesn't allow NULL values.
In a relational database it is used as a way to uniquely identify a record in a table. It also allows tables within the database to reference the specific record within the table. For example, a common practice is to have the database automatically determine the Primary Key with an auto-incrementing value starting at 1 upon inserting each new record. The reason for uniquely identifying the record is there could be cases where the data between two records are exactly the same, but they need to be separate as they do represent different things. For example, let's say you have a database containing the name of a person "John Smith". What would happen if you added "John Smith" into the database multiple times without a Primary Key? By providing the Primary Key as shown below, you can now reference the correct "John Smith". Id Name 1 John Smith 2 John Smith
Acid cursor data database field primary & foreign keys procedure & function odbc & oledb normalization trigger
No. A table is the primary object used within a database to store data. A typical database will consist of many tables.
We know that schema in the database is refer to the basic design of that database and is stored in an object . That object is known as schema object of database.
Acitex data object database
One can find information about an object oriented database in the book 'On Object Oriented Database Systems'. One can also find information about an object oriented database online on the IndiaBix website.
Relational Database
A database administrator's responsibilities can include the following tasks: future storage requirements for the database system. Creating primary database and the database tools and applications are executed on remote computers.
in database
Simple Object Database Access was created on 2002-04-16.
Activex data object Database connection Activex data object Database connection
simplified standard model of database
With reference to Databases, what are Primary keys?
acitex data object database control