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what is the use of group by clause group by clause is used to apply aggregate functions to a set of tuples
write short notes on schema diagram a database schema along with primary key and foreign key dependencies can be depicted pictorially by
define query language a query is a statement requesting the retrieval of information the portion of dml that includes information retrieval is
write short notes on domain relational calculus the domain relational calculus uses domain variables that take on values from an attribute
write short notes on relational model the relational model uses a collection of tables to show both data and
define the terms i ddl ii dml ddl data base schema is specified by a set of definitions expressed by a special
explain the two types of participation constraint total the participation of an entity set e in a relationship set r is said to be total if each
define weak and strong entity sets weak entity set entity set that do not have key attribute of their
the fancy new french restaurant la food is very popular for its authentic cuisine and high prices this restaurant does not take reservations to help
define single valued and multivalued attributes single valued attributes attributes with a single value for a particular entity are known as
what is an entity relationship model the entity relationship model is a collection of basic objects known
hypothetical reliable data transfer protocol a jumping window based go-back-n arq protocol for file transfer using udp as the transport
what is a data dictionary a data dictionary is a data structure which keeps meta data about the structure of the database ie the schema of the
develop a tcp-based client-server socket program for transferring a large message the message transmitted from the client to server is read from a
develop a socket program in unixlinux that uses i tcp as the transport protocol and ii udp as the transport protocol for transferring a short
what is storage manager a storage manager is a program module that gives the interface between the low
define the terms 1 physical schema 2 logical schema physical schema the physical schema explains the database design at the physical level
define instance and schema instance collection of data kept in the data base at a particular moment is
normal 0 false false false en-in x-none x-none microsoftinternetexplorer4
illustrate about tinysec protocol tinysec is implemented on the link layer and addresses security requirements of the resource staffed nodes in the
q explain about security aware protocolsthe security-aware ad hoc routing sar protocol based on the security attributes integrated into the ad hoc
innovative nature of triple key management the triple key management scheme provides secure services by combining different techniques whic
q in the ibm370 memory protection is offered through the use of keys a key is a 4-bit quantity every 2k block of memory has a key the storage key
sharing segments between processes without requiring the same segment number is possible in a dynamically linked segmentation system a define a
q explain a mechanism by which one segment could belong to the address space of two different processesanswer because segment tables are a collection