20)Consider the following Entities and Relationships [30 Marks]
Person (pno, person_name, birthdate, income)
Area (area_name, area_type)
Relation between Person and area is Many to One.
Constraint: Primary key, income should be > 0, area_type should be rural or urban.
Create a Database in 3NF & write queries for following.
• Display persons having income less than 1 lakhs in PCMC Area.
• Display population of each area.
• Display persons details from 'Urban' area.
• Display the details of area having population greater than that of in Pune.
• Display details of person from each area having minimum income
Solution:-
Create a Database in 3NF & write queries for following.
• Display persons having income less than 1 lakhs in PCMC Area.
SQL> select pname from persons,area where persons.ano=area.ano and aname='pcmc' and income <100000;
• Display population of each area.
SQL> select population,aname from persons, area where persons. ano= area.ano group by aname,population;
• Display persons details from 'Urban' area.
SQL> select pname from persons,area where person.s ano=area. ano and atype='urban';
• Display the details of area having population greater than that of in Pune.
SQL> select max(population),aname from area where aname='pune' group by aname;
• Display details of person from each area having minimum income.
SQL> select pname,brithdate,income from persons where income=(select min(income) from person);
/
• Display persons having income less than 1 lakhs in PCMC Area. SQL> select pname from persons,area where persons.ano=area.ano and aname='pcmc' and income <100000;
• Display population of each area. SQL> select population,aname from persons, area where persons. ano= area.ano group by aname,population;
• Display persons details from 'Urban' area. SQL> select pname from persons,area where person.s ano=area. ano and atype='urban';
• Display the details of area having population greater than that of in Pune. SQL> select max(population),aname from area where aname='pune' group by aname;
• Display details of person from each area having minimum income. SQL> select pname,brithdate,income from persons where income=(select min(income) from person);
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