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What is NULL? Give an example to described testing for NULL in SQL?
The NULL SQL keyword is used to represent either a missing value or a value which is not applicable in a relational table. Consider there is a relation:
Person(id, name, address, phone)Now to search ids and names of person who do not have a phone is: Select id, name from Person where phone is null
FDs in Entities : Student entity : Enrolment number → Student name, Address Course Entity :
compare the features of oracle RDBMS with MySQL and Microsoft SQL server
What is the main advantage of the object model? What are its different components? The object model focuses on the logical data structures. Each object model comprises of many
One-way Associations When an association is traversed only in the one direction, then it is implemented as a pointer i.e.an attribute which contains an object reference. If mu
My cut off date is very soon in a Database subject and i dont know how to solve anything in it
Using your cache simulator and using smalltex.din as your memory trace determine the total miss rate, compulsory miss rate, capacity miss rate, and conflict miss rate for the follo
how many hourse have been spent on a certain project
List the string operations supported by SQL? 1) Pattern matching Operation 2) Concatenation 3) Extracting character strings 4) Converting among uppercase and lower cas
In Database software have only pure security or some dis secured by administrator?
With the linear commit protocol, sites are connected in a chain, and the subtransaction at the left-hand end of the chain initiates the protocol. Propose a crash recovery protocol
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