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Which database object does not physically exist?
A view database object does not physically exist.
Describe Database state in details? Database state: The actual data within the database at a particular moment in time is known as a database state.
A Distributed Transaction Let us demonstrate the concept of a distributed transaction by considering a banking system having of three branches located in 3 different cities. Ev
Consider employee table of (i) and list names of department(s) for which average salary for department is more than 10,000. (SELECT d_name FROM dept WHERE d_code IN (SELECT d_c
Mention the several levels in security measures. A) Database system B) Operating system C) Network D) Physical Human
Which language used in application programs to request data from the DBMS is referred? Language which is used in application program is DML to request data from the DBMS is ref
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
What are the two types of indices? The two types of indices are:- A) Dense index B) Sparse index
What is foreign key? A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a
how to prepare a data dictionary for online examination system for certified courses?
Q. Explain data aggregatio n and discuss different design constraints. Sol. Aggregation One limitation of the E-R model is that it cannot express relationships amon
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