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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
(a) Why did SAP introduce the extended star schema?
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What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
I need help with data warehousing and business intelligence course project about designing a data warehouse for a jewelry company that does not have one
what are the purposes of dbms in details
What is a Data Flow Diagram? Data Flow Diagram: A data flow diagram is the graph that shows flow of data values from their sources in objects in the course of processes whic
The database will enable college administrators the ability to track students initial major. This will help college officials decide how best to prepare students for their goals an
In the first unit of this block, you have been given with the details of the Database Management System, its structure, advantages etc. This unit is an attempt to give you informat
An employee record has the following structure struct employee { int eno; char name[22]; float salary; char dept[10];}; (i) Calculate the record size R in bytes.
let us consider a table having 2200 records and the fixed size of the table to be considered as 25.then how many numbers of table is requredto perform horizontal fragmentation
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