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Page 1: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

CS 103: Lecture 7

Page 2: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

More Query Features

• Calculated fields– A field that displays the result of and expression

consisting of fields, numbers and arithmetic operators

– For example• Wages*(Hours-40)*1.5

– Usually used as part of the result of a query

Page 3: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

More Query Features

• Aggregate functions– Functions that perform arithmetical or statistical

operations on selected records– The selected records are either all the records in a

query result or groups (subsets) of the records in a query result

– Common aggregate functions• Average, Count, Maximum, Minimum, Sum

Page 4: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

More Query Features

• GroupBy– Divides selected records into distinct groups based

on the values in a specified field– Another way of saying this is that GroupBy breaks

the selected records into subsets based on the values in a specified field.

Page 5: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

GroupBy Example• Consider the following course table rows

CnumCname Department CHoursPHY102 Introduction to Physics Physics 4PHY101 Physics for Dummies Physics 1CHM101 Introduction to Chemistry Chemistry 4CHM300 Biochemistry Chemistry 4MTH300 Mathematical Logic Mathematics 3CS400 Theory of Computation Computer Science 3SOC200 A Dummies Guide to Max Weber Sociology 3RUS400 Writing Short Novels I Russian 4RUS401 Writing Short Novels II Russian 3ECO101 Introduction to Economic Economic 3ECO102 Money and Banking Economics 2POL101 Introduction to Political Science Political Science 3POL102 Public Administration Political Science 3CS442 Compilers Computer Science 4CS050 Using a Mouse Computer Science 1CS300 Genetics for Computer Scientists Computer Science 3

Page 6: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

GroupBy Example

• How many groups are formed by a GroupBy on Department?

• How many groups are formed by a GroupBy on Chours

• How many groups are formed by a GroupBy on Cnum?

Page 7: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

GroupBy Department• Group 1 (Physics)

PHY102 Introduction to Physics Physics 4PHY101 Physics for Dummies Physics 1

• Group 2 (Chemistry)CHM101 Introduction to Chemistry Chemistry 4CHM300 Biochemistry Chemistry 4

• Group 3 (Mathematics)MTH300 Mathematical Logic Mathematics 3

• Group 4 (Russian)RUS400 Writing Short Novels I Russian 4RUS401 Writing Short Novels II Russian 3

• Group 5 (Economics)ECO101 Introduction to Economic Economics 3ECO102 Money and Banking Economics 2

• Group 6 (Political Science)POL101 Introduction to Political Science Political Science 3POL102 Public Administration Political Science 3

• Group 7 (Computer Science)CS442 Compilers Computer Science 4CS050 Using a Mouse Computer Science 1CS300 Genetics for Computer Scientists Computer Science 3CS400 Theory of Computation Computer Science 3

Page 8: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

GroupBy CHours• Group 1 (3)

MTH300 Mathematical Logic Mathematics 3ECO101 Introduction to Economic Economics 3POL101 Introduction to Political SciencePolitical Science 3POL102 Public Administration Political Science 3CS300 Genetics for Computer Scientists Computer Science 3CS400 Theory of Computation Computer Science 3RUS401 Writing Short Novels II Russian 3

• Group 2 (4)PHY102 Introduction to Physics Physics 4CHM101 Introduction to Chemistry Chemistry 4CHM300 Biochemistry Chemistry 4RUS400 Writing Short Novels I Russian 4CS442 Compilers Computer Science 4

• Group 3 (1)CS050 Using a Mouse Computer Science 1PHY101 Physics for Dummies Physics 1

• Group 4 (2)ECO102 Money and Banking Economics 2

Page 9: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

GroupBy Cnum?

Page 10: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

Access Demonstration

• I will give an example of creating a relationship between Section and Course (we discussed this relationship in lecture)

• I will create examples of queries that use calculated fields, aggregate functions and GroupBy on the Orders table.

Page 11: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

ER Diagram

SectionSNum

SemesterYearTimeRoom

CourseCNum

CNameDepartment

CHours

Schedule

M 1

Page 12: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

Example Section (time and room not shown)and Course Tables

Section

SNum Semester Year CNum

0001 Fall 2005 CS120

0002 Fall 2005 CS103

0003 Spring 2006 ACC221

0004 Spring 2006 CS120

0005 Spring 2007 CS103

0006 Fall 2007 CS103

Course

CNum CName Department CHours

CS103 Database Computer Science

1

CS120 Soft. Eng. Computer Science

4

ACC221 Intro. To Acct.

Accounting 3

Page 13: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

Example Section (time and room not shown)and Course Tables

Section

SNum Semester Year CNum

0001 Fall 2005 CS120

0002 Fall 2005 CS103

0003 Spring 2006 ACC221

0004 Spring 2006 CS120

0005 Spring 2007 CS103

0006 Fall 2007 CS103

Course

CNum CName Department CHours

CS103 Database Computer Science

1

CS120 Soft. Eng. Computer Science

4

ACC221 Intro. To Acct.

Accounting 3

Page 14: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

Orders Table

ordnum product supplier unitPrice quantity

O1 pencil Acme supply 0.10 100

O2 desk Furniture farm 150.00 30

O3 copy paper Acme supply 20.00 300

O4 toner Acme supply 12.00 5

O5 pencil Office barn 0.05 30

O6 chair Furniture farm 100.00 10

Page 15: CS 103: Lecture 7. More Query Features Calculated fields – A field that displays the result of and expression consisting of fields, numbers and arithmetic

Query Problems

• Find the number of orders made to Acme Supply• Find the number of orders for each supplier that has at least one order• Find the total number of items order for each product• Find the total dollars of orders for each supplier• Find the total dollars of orders for each product


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