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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 mappings between these two. In a few DBMSs, a clear separation is maintained among conceptual schema and internal schema. In that case, DDL is used to exact the conceptual schema only. The other language, storage definition language (SDL) is used to specify the internal schema. The mappings among the two schemas may be specified in either one of these languages.
What is Outer join? They can be employed while we want to keep all the tuples in R, or all those in S or all those in both relations in the result of the JOIN in spite of of w
Consider a relation s over the attributes A and B with the following characteristics: 5,000 tuples with 10 tuples per page A 2-level B+ tree index on attribute
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
Describe entity referential integrity and integrity. Give an example of each. Entity Integrity Rule - If there is a attribute A of relation R is a prime attribute of R then A
Define reference file
what is inverted and multilist structure
it can be possible to create any table without primary key
Explain the challenges before an E-business management.
Saving Derived Attributes to Avoid Re-computation As discussed, "redundancy means duplication of exact data". But, if multiple copies of same data are present in the system,
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