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Explain Data Sublangauges ?
Data sublanguage: In relational database theory, the term sublanguage, first used for this purpose through E. F. Codd in the year of 1970, refers to a computer language used to describe or manipulate the structure and contents of a relational database management system (RDBMS). Typical sublanguages related along with modern RDBMS's are QBE (Query by Example) and SQL (Structured Query Language).
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what is the importance of back up files
various techniques of hashing?
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
Which database level is closest to the users? External database level is closest to the users.
If R1 and R2 are two relations or functions, then the result of R3 = R1 × R2 is the combination of tuples that are in R1 and R2. The product is associative and commutative. Degr
In how many parts events are classified Events are classified as four types in UML 1. Signals 2. Calls 3. Passing of Time 4. Change in State
Views in relational algebra: 1. Basic expression contains either a) A relation in the database. b) A constant relation. 2. General expressions are madde out of sma
Insulation between conceptual and physical structures It can be defined as: 1. The Database Administrator should be capable to vary the storage structures without affectin
Describe Dynamic Model. The dynamic model specifies allowable sequences of changes to the objects from an object model. It contains event trace diagrams describing scenarios. A
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