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Explain retrieval in QBE?
Retrieval in QBE : A "GUI" for expressing queries.
But has influenced many projects Especially PC Databases: Paradox, Access, etc.
The result of the UNION operation between R1 and R2 is a relation that includes? The result of the operation between R1 and R2 includes all the tuples of R1 and R2 which have c
Explain the Cascadeless Schedule A cascadeless schedule is one in which for every pair of transactions Ti and Tj like that Tj reads a data item before written by Ti, the commit
Problem : (b) A deductive database system is essentially the outcome of applying mathematics logic to database management, where logic is used for both data representation 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.
What is the most significant feature that does not directly map into programming language structures? Why? Association, since there are complex types of association, like as qu
The Maximum no of key fields that can be used in a header is?? 50
Hello.I have database access assignment which consist of creation Form, Subform, Calculation, Macros
Differentiate between Procedural and non procedural languages ? Procedural and non procedural languages - A procedural language specifies the operations to be performed on th
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
What are the various symbols used to draw an E-R diagram? Explain with the help of an example how weak entity sets are represented in an E-R diagram. Various symbols used to d
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