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logical operatorsrules of precedenceorder evaluatedoperator1all comparison operators2not3and4orexample to produce those records of salesman or
special comparison operator used in where clausea between andit gives range among two values inclusiveexampleselect ename sal from empwhere
to eliminate duplicate rows distinct operator exampleselect distinct deptno from
using literal character stringexampleto print ltnamegt is a ltjobgt as one string with column name employeeselect ename is a job as employee from
concatenation operatorexample printing name and job as one string as column name employees select enamejob employeesfrom
using column aliasesexampleto print column names as name and annual salary select ename name sal12 annual salary from
operator precedencethe basic operators used in sql are - operators of the similar priority are evaluated from left to rightparentheses are
select statementthis statement is used for retrieving information from the databases it can be coupled with many clauses let us talk about these
data manipulation languagedata manipulation language dml describes a set of commands that are used to query and change data within existing schema
drop table commandwhen an existing object is not needed for further use it is always better to eliminate it from the database to remove the existing
example -alter table emp modify empno number
alter table command this command is used for variation of existing structure of the table in the given situation when a new column is to be added to
create table prodtranspno number 4ptype char 1 check ptype in irs qty number 5foreign key pno references product pno on delete cascade in the
column constraints not null unique check primary key default referenceson delete cascade using this key whenever a
guidelines for creation of table table name should begin with an alphabet in table name single quotes and blank spaces are not allowed reserve words
data definition languageit organises the data in the form of columns and rows but what does the data field column of table accumulate how do you
difference between sql and sqlplussqlsqlplussql is a languagesql plus is an environmentit is based on
hard drive has space but it keeps telling me that its full and asks me to delete files i checked there is nearly full c drives 8gb but when i am open
question 1the following is a dump of a tcp header in hexadecimal format00cd0018 00000ef1 00000d5d 502200d1 01bf0010please answer the following two
overviewin this assignment your program will simulate protein synthesis from dna specically it reads a dna string from a file specified on the
connectionless multiplexing and de multiplexingjava program running in a host can create a udp socket with the linedatagrams socket my
overview of the transport layer protocolstransport layer can be available more than protocols to the network
transport layerin computer networking it the transport layer is where sessions are exchanged between hosts this layer resides
dns records and messagestwo types of records are used dns the question records are used in the question section of the query
authoritative dns serversevery organization with publicly accessible hosts such as web server and mail several on