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Whst is logical schema ?
Logical schema is the entire database.
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
Determine the Strong and Weak Entity Based on the method of foreign key, there might be arise a situation when we have to relate an entity having a primary key of its own and a
Write an sql statement to find what is the percentage of home policies which are from the state of Arizona out of all Home policies by Policy Value.
external and internal mapping with examples
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
Describe entity referential integrity and integrity. Give an example of each. Entity Integrity Rule - If there is a attribute A of relation R is a prime attribute of R then A
what are the topics in data management
What is Message switching Message switching transmits data units which can be arbitrarily long. Packet switching has a utmost packet size, if any message longer than that, it s
(a) Why did SAP introduce the extended star schema?
Ask questiwhat is row indicator in database on #Minimum 100 words accepted#
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