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Define tuple variable? Tuple variables are used for comparing two tuples in the same relation. The tuple variables are explained in the from clause by way of the as clause.
What are the two approaches to store relations in distributed database? a) Replication b) Fragmentation
What are axioms? Axioms or rules of inference give a simpler technique for reasoning about
A Relation Schema represented by R(A1, A2, ..., An) is made up of the relation name the list of attributes and R Ai that it contains. A relation is described as a set of tuples
What are called journaling file systems? File systems that support log disks are known as journaling file systems.
For each m:n relationship type R, we make a new table (say S) to represent R. We also contain the primary key attributes of both the participating entity types as a foreign key att
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
Explain data dictonary on oracle ? Data Dictionary - Data dictionaries are the system tables in which contain descriptions of the database objects and how they are structured.
Explain the structure of well formed formulae in relational calculus. Ans: a. An atom is a formula b. If P1 is a formula, after that so are ¬P1 and (P1) c. If P1 and P2 a
how to write a in a text and load it on mysql
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