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What is D command work in the respect of QBE?
D: It is the command inside QBE to delete tuple(s) from the relation.
Differance between DDL and SDL? DDL and SDL - The data definition language (DDL) is used through DBA and database designers to describe internal schema, conceptual schema, and
What is the use of keyword ISA? The use of keyword ISA is to show that a class is a specialization of another class.
The clause in SQL which specifies that the query result should be sorted in ascending or descending order based upon the values of one or much more columns is Ans : Order by
Explain the Weak Entity Set An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in
employee(empid,empname,dept,telno,mobno, add,sssno,tinno,WEdates,WEcomp,WEadd,WEpos,WEres) this is a employee record which is need to be normalize.the WE means work experience
1. Staff(staffID, firstName, lastName, availabilityID, experience, phone, mobile, email); 2. Availability(availabilityID, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday,
Authorisation Authorisation is the culmination of the administrative policies of the organisation. As the name shows, authorisation is a set of rules that can be used to verif
What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files
Query Processor The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form
why shadow copy technique is used?
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