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Explain Data Sublangauges ?
Data sublanguage: In relational database theory, the term sublanguage, first used for this purpose through E. F. Codd in the year of 1970, refers to a computer language used to describe or manipulate the structure and contents of a relational database management system (RDBMS). Typical sublanguages related along with modern RDBMS's are QBE (Query by Example) and SQL (Structured Query Language).
Implementation of association as an object Implement as a separate association object, independent of either class, as in Figure. An association object is a group of pairs
Modify a sequence: ALTER SEQUENCE SEQSS INCREMENT 2 MAXVALUE 3000; Removing a sequence: DROP SEQUENCE SEQSS;
(a) Design a query plan for the following distributed query: An application at site B wants to compute a join of STUDENT ? Id=StudId TRANSCRIPT where STUDENT (Id,Major) is at site
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
Hi is anyone well versed in accounting information systems available now to help me work through an important assignment due tomorrow at noon?
An entity type usually has an attribute whose values are distinct for every individual entity in the collection. Such an attribute is known as a key attribute and its values can be
external and internal mapping with examples
Explain Two phase locking protocol A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the tra
data models are being replaced over years. Reasons and why does that happen?
Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
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