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Q&A Bank >> 18 January 2013



Q : transactions in sqlbegin transaction commit and rollback
Q : effects of null for multiple assignments - sqlif the row
Q : multiple assignment- sqlsql supports multiple assignment to
Q : merge and truncate in sqlsql has two more table update
Q : example of delete - sqlas with update a for portion of
Q : delete command - sqlloosely speaking delete removes some
Q : update command- sqlloosely speaking update changes some of
Q : example of except operator - sqlexample like its
Q : insert command in sqlloosely speaking insert takes the rows
Q : updating tables in sqlthe topic of updating by describing
Q : example of foreign key constraintexample alternative
Q : example of when or then constraintsa concrete example
Q : when or then key constraintssuppose a table has two columns
Q : effects of null for unique specificationwhen a unique
Q : keys in sqlsql support for keys in the following
Q : i have been given 8 differebt data warehouseing failure
Q : can anyone solve this assigmentltbrgtdlsqrt3x-5 sqrt2xl
Q : primary key - sqla primary key specification carries an
Q : example of shorthand for a row constraintexample shorthand
Q : check constraints in sqla check constraint is a table
Q : effects of null in aggregate operator - sqllet aggopx be an
Q : effects of null for table expressionheres an important
Q : between and not between operator in sqlexample restricting
Q : use of table comparisons - sqltable comparisons where it is
Q : example of not exists operator - sqlexample is a
Q : example of alternative formulation as a table
Q : purification and treatment of waterin purification and
Q : example of not exists in sqlexample use of not existscreate
Q : use of count in sqlit describes and discusses various
Q : procedural constraint enforcement triggers sql has an
Q : use of table expressions - expressing constraint
Q : when are constraints checked under the model constraints
Q : not enforced table constraintsa constraint that is not
Q : example of check constraintsexample workaround for when
Q : example of add constraint in sqlexample alternative
Q : row counterparts of table operatorssql does not have
Q : operators on tables and rowsrow extractiontuple from r sql
Q : table comparison - sqlthe following definitions for
Q : example of unwrap operator - sqlexample here shows how
Q : example of wrap operator - sqlthe effect of example can be
Q : shear forces and bending momentsa beam is a structural
Q : wrapping and unwrapping in sqloperators wrap and unwrap in
Q : unnest operator in sqlthe inverse operator of group is
Q : example of group by and collect operatorexample using group
Q : example of groupby operatorexample how many students sat
Q : example of coalesce operatorexample give the total of marks
Q : example of cast operator so long as cast is used as shown
Q : example of using aggregation on nested tablesexample how
Q : using aggregation on nested tablesexample is the most
Q : example of tables within a table - sqlexample obtaining cer
Q : max and min operator in sqlexampleselect max mark from
Q : count operator in sqlexample counting the students who have
Q : aggregate operators sqlsupports all of the aggregate
Q : semijoin and composition - sqlfor semijoin the dyadic
Q : effects of null for union - sqlthe treatment of null in
Q : semidifference via not in and a subqueryselect
Q : semidifference via except and join - sqlselect from select
Q : semidifference and not - sqlin this section first describe
Q : union all - sqlfurther varieties of union arise when we
Q : union without corresponding - sqlthe use of union without
Q : closest approximation to relational union - sqlactually
Q : union and or - sqlsql supports union explicitly but
Q : extension and and in sqlthe theory book gives the following
Q : restriction in sqlsyntaxselect distinct studentidfrom
Q : principal stresses and strainsprincipal stresses and
Q : restriction and and - sqlrestriction is available via the
Q : special cases of projectionthis section describes the
Q : enrolment was split - sqlexample shows how relvars iscalled
Q : projection in sql - correct versionstudent studentid is
Q : projection and existential quantification - sqlintuitively
Q : using rename in combination with join - sqlexample gives
Q : sql outer joinselect from iscalled natural left join
Q : explicitly specifying the join condition - sqlselect from
Q : obtaining a natural join by specifying the common
Q : definition of from - sqlrecall that the operand of from is
Q : interesting properties of cross join - sqlcompare these
Q : definition of cross join - sqllet s t1 cross join t2 where
Q : join and and in sqlin this section is all about one
Q : relational operators and logical operatorsit prepares the
Q : relational algebra - sqlit describes some operators that
Q : existential quantification - sqlexistential
Q : quantification in sqlto quantify something as the theory
Q : logical connectives - sqlsqls extended truth tables in
Q : deriving predicates from predicates in sqlthe corresponding
Q : table represents an extension - sqlit describes how each
Q : substitution and instantiation - sqlit shows how null might
Q : predicate - sqlconsider the declarative sentence-a
Q : updating a variableassignment of an attribute value in a
Q : assignment source not a literal - variablesyntaxset sn sid
Q : assignment of variable - updating a variablesyntaxset sn
Q : adding table constraints alter table enrolment add
Q : effect of anonymous columnsnow recall that a values
Q : water quality analysisthis water quality analysis presents
Q : creating a tablesyantaxcreate table enrolmentstudentid
Q : variable declaration - sqlsqls support for variables is
Q : type versus representation confusion in sqlthis describes
Q : third step at defining type sid in sqlcreate domain sid as
Q : second step at defining type sid in sql create type sid as
Q : first step at defining type sid in sqlcreate type sid as c
Q : water sources and requirementsin this part we have
Q : data types and representationsthis explains the concept
Q : effects of null in table literalwhen a values expression
Q : example of table literal - sqlexample a table literal
Q : table literals - sqlone might expect sql to support table
Q : multiset types - sqlan sql multiset is what in mathematics
Q : usefulness of data type in sql as in most computer
Q : data types in sql - xml array row binary large object for
Q : data types in sql - interval booleaninterval for values
Q : data types in sql - timestamptimestamp for values
Q : data types in sql - integerinteger or synonymously int
Q : data types in sql - decimaldecimal numeric real float and
Q : data types in sql - charactercharacter or synonymously char
Q : data types in sqlsqls concept does not differ significantly
Q : cause of indeterminacy in sqlone root cause of
Q : indeterminacy in sqlsome sql expressions are actually not
Q : example of null operator - nino ruleif we wanted to make
Q : effects of null operatoras a general rule-but not a
Q : read-only operator - sqlthe term read-only operator to the
Q : important distinctionsthe list of important distinctions
Q : effects of nullthe numeric variable x perhaps of type
Q : sqls fifth concept - null unfortunately sql embraces a
Q : updating by insertionsyntaxinsert into enrolmentvalues sid
Q : updating by replacementsyntaxupdate enrolment set name
Q : updating by deletiondelete from enrolment where studentid
Q : updating variablesfor assignment sql uses the key word set
Q : authorisations - privilegesas relational theory is silent
Q : programmes directed towards the common crop plantsthese
Q : types of mechanism - stress conditionplants have evolved a
Q : induction of defensive barriers in plants several polymers
Q : protection of plants against toxic substancesplants produce
Q : response to woundingwounding of tomato plants by mechanical
Q : induction of disease resistance in plants by heat-shockthe
Q : production of substances interfering with virus
Q : induction of antimicrobial substances phytoalexins are
Q : ethylene production - responses to infectionethylene is
Q : induction of hydrolases - responses to infectionplants do
Q : response to floodingprolonged flooding or water-logging
Q : cold hardiness and cold acclimationin connection with cold
Q : types of stress caused by freezingthus freezing can cause
Q : response to cold - responses of plants to stresslet us
Q : heat-shock responsewhen growing plantlets or tissues of
Q : response to heavy metal stress several heavy metals
Q : osmotic adjustment or osmoregulation - osmotic stressif
Q : light stress in chloroplastsas mentioned earlier very high
Q : photosynthesis - responses of plants to
Q : water stress - responses of plants to stresswater stress in
Q : plant responses to specific stress conditionsby now you
Q : use of alternate metabolic pathwaysplants surviving under
Q : long-term responses - behaviour of plantsplants alter their
Q : quick transient responses - behaviour of plantssuch
Q : morphological changesaquatic plants produce different kinds
Q : quantitative changesthe quantitative changes in the
Q : qualitative changesthe qualitative changes in the structure
Q : changes in the conformation of molecules - qualitative
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