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Differentiate between a unique key and a primary key.
- By default, clustered index on column are created by primary key while nonclustered index are created by unique key.
- Primary key doesn't allow NULLs however unique key allows one NULL.
Security: Data not needed by local applications is not stored at the site, therefore no unnecessary security violations may exist. But how can we carry out fragmentation? Fragm
Relationship between Security and Integrity: Database security usually refers to access, while database integrity refers to avoidance of accidental loss of consistency. But usually
i want to database for online assignment submission system
what is cascading rollback
PRINCIPLES OF DATABASE 1. State the following terms: a) Database b) Database Management System c) Entity d) Attribute e) Relationship 2. Discuss the Three Level Architecture
What is a view in SQL? When can views be updated? A view is a virtual table which consists of columns from one or more tables. Through it is same to a table; it is stored in
What are the different kinds of database end users? Discuss the major activities of each? End-Users - End-users are the people whose jobs need access to the database for que
What is meant by functional dependencies? Consider a relation schema R and α C R and β C R. The functional dependency α ->β holds on relational schema R if in any legal relati
Define physical and logical data independence. How does this architecture help in achieving these? Data independence entails that change in one view must not need a change in t
multiplicity constarin
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