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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
Explain the disadvantages of using DBMS There could be a few disadvantages of using DBMS. As DBMS requires computers, we have to invest a good amount in acquiring the hardwa
wh
State the data flow diagram of functional model Any action initiated by transition in the state diagram can be extended into an entire data flow diagram in functional model. Th
With the help of an example display how records can be deleted and updated in QBE. (i) Increase Pay_Rate of employees along with the skill of ‘cook' by 10%. (ii) Delete employee
Define the terms 1) physical schema 2) logical schema. Physical schema: The physical schema explains the database design at the physical level, which is the lowest level of abs
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
What is a view? A view is a logical view on one or more tables. A view on one or more tables i.e., the data from a view is not actually physically kept instead being derived f
Which method is used to key transformation ? A hash method is used to key transformation.
List the internal controls that should be in effect solely because a EDP system is employed, classifing them as (1) Those controls pertaining to input of information and (2) All ot
discuss the purpose of the concurrency control?
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