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In the architecture of a database system which external level used? In the architecture of a database system view external level used.
To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;
How many physical thing?
Define Partial Key and Primary Key A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar o
A B-tree of order how much children m has maximum ? m has maximum m mchildren in a B tree.
What is object containment? References among objects can be used to model dissimilar real-world concepts.
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.
Differance between Unordered and ordered file ? Unordered file do no has any sequence although ordered file has arranged in a few sequence and data are assigned in ordered form
Describe substring comparison in SQL. For the relation Person (name, address), write a SQL query that retrieves the names of people whose name starts along with ‘A' and address co
Define data conversion? Helpful to load data into temporary staging tables. Then can write SQL code to do much of data processing. SQL code is simpler and faster to write than
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