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What is transaction?
Collections of operations that form a single logical unit of work are known as transactions.
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Describe Database state in details? Database state: The actual data within the database at a particular moment in time is known as a database state.
What are the Overlapping elements Overlapping elements can be found by scanning all the elements in front of deleted element in priority list for the sheet and comparing them
Define in which normalisation form if an attribute of a composite key is dependent on an attribute of other composite key. Ans: 3NF A relation is in 3 NF if an attribute of
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UNION If R1 and R2 are two union compatible relations then R3 = R1 ∪ R2 is the relation having tuples that are either in R1 or in R2 or in both. In case, R3 will have tuples
limitations and benefits in database tecknowlagy
multidimensional data model
Give the two reasons for allowing concurrency
Retrieve the S&S In-Chapter Database (in Microsoft Access format) from the text's Web site (or create the tables in Table 4-5 in a relational DBMS product). Write queries to answer
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