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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
Define According to the levels of abstraction, the schema at the intermediate level is called Ans: As per to the levels of abstraction, the schema at the intermediate level is
wrie a report on whether a BSc n information systems develops the skills required by employers in Database administration
Aggregation Aggregation is stronger form of association. It represents the "has-a" or "part-of" relationship. An aggregation association depicts a complex object which is comp
Why older data models are being replaced by new data modelling 100 words accepted#
What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
Assume that you are responsible for selecting a new DBMS product for Sohar Hospital
how many types of data model in DBMS? explain data abstraction with its different level
Every simple attribute of an entity type have a possible set of values that can be attached to it. This is known as the domain of an attribute. An attribute cannot have a value out
Explain the following functions of Oracle with suitable examples: (i) To_Char( ) (ii) Count( ) (iii) Trim( ) (iv) Length( ) Ans: (i) To_char( ): The TO_CHAR function conver
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
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