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Define- relational algebra.
The relational algebra is a procedural query language. It having of a set of operations that take one or two relation as input and make a new relation as output.
Explain the Weak Entity Set An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in
Describe the objective of Structural Diagrams The main objective of structural diagram is to visualize, construct, specify and document static aspects of a system. Their eleme
Describe Graphical User Interface? Graphical User Interfaces (GUIs) - A GUI typically displays a schema to the user in diagrammatic form. The user can then specify a query th
List the table modification commands in SQL? A) Deletion B) Updates C) Insertion D) Update of a view
Define rotational latency time. The time spent waiting for the sector to be accessed to appear under the head is known as the rotational latency time.
First Normal Form and second normal form First Normal Form (1NF) A relation is said to be in 1NF if it having no non-atomic values and each row can give a unique combinat
File Manager File manager handles the allocation of space on disk storage. It starts and maintains the list of structures and indices described in the internal schema that is
#explain five disadvantages of a dbms..
Ask questiwhat is row indicator in database on #Minimum 100 words accepted#
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
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