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What is trigger
Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
When is a transaction rolled back? Any changes that the aborted transaction made to the database must be uncompleted. While the changes caused by an aborted transaction have be
What it creates while a primary key is combined with a foreign key? It creates Parent-Child relation ship between the tables that connect them while a primary key is combined w
write program
Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table EMPNO ENAME MGRID
I have a small project that contains 3 deliverable s. I have done the first one and I would like you to help me with second one
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
Define Timestamp ordering Ans In timestamp-based method, a serial order is made among the concurrent transaction by assigning to every transaction a unique nondecreasing number
Relational Algebra is a set of basic operations used to influence the data in relational model. These operations allow the user to specify basic retrieval request. The result of re
The primary key is selected from the
What is the main advantage of the object model? What are its different components? The object model focuses on the logical data structures. Each object model comprises of many
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