Session 6#

1. Introduction to Windows
Phone & Database
Session 6#

2. 1
2
3
4
5
Discussion on your apps
Introduction to Database
What’s DBMS
SQL Database Manipulation
Exercises
Agenda

3. Your Apps

4. Your Apps

5. Your Apps

6. Your Apps
 Pros
 Readable Code
 Didn’t fail any test case
 Simple interface
 Cons
 Very abstract interface ( Not impressive )
Score 7 / 10

7. Your Apps

8. Your Apps
 Pros
 Readable Code
 Didn’t fail any test case
 Simple interface
 Cons
 Non matching colors
 Some parts in the layout are not responsive
Score 6.5 / 10

9. Your Apps

10. Your Apps
 Pros
 Readable Code
 Didn’t fail any test case
 Simple interface
 Cons
 Non matching colors
 Not responsive
Score 5.5 / 10

11. Your apps

12. Your Apps
 Pros
 Readable Code
 All test cases passed
 Elegant interface
 Cons
 Some components are responsive and some are not
Score 7 / 10

13. Your Apps

14. Your Apps
 Pros
 Readable Code
 Failed a test case ( Only one ) 
 Elegant interface
 Developed more functionalities
 Cons
 One of his extra functionalities produces wrong output
 His design is not creative
 Over handling to exception that will never happen (Long code)
Score 8 / 10

15. Your Apps

16. Your Apps
 Pros
 Readable Code
 All test cases passed
 Creative interface
 Cons
 Some components are responsive and some are not
Score 8 / 10

17. What is Database
 A structured set of data held in a computer, especially one that is
accessible in various ways.

18. Types of database

19. Database Management System
 A database management system (DBMS) is system software for creating and
managing databases.
 The DBMS provides users and programmers with a systematic way to
 Create
 Read
 Update
 Manage data

20. Data manipulation

21. Structured Query Language
 Structured Query Language (SQL) is a standard
computer language for relational database management and data
manipulation.
 SQL is used to query, insert, update and modify data.

22. Manipulation level
Database
Tables
Queries

23. Create
 Database:
CREATE DATABASE DB_name ;
 Table:
 CREATE TABLE table_name(
column1 datatype,
column2 datatype,
..... ,
columnN datatype,
PRIMARY KEY( one or more columns )
);
 Query:
 INSERT INTO TABLE_NAME VALUES (value1, value2,
value3,...valueN);
 INSERT INTO TABLE_NAME (column1, column2,
column3,...columnN) VALUES (value1, value2, value3,...valueN);

24. Data Types
 CHARACTER [(length)] or CHAR [(length)]
 VARCHAR (length)
 BOOLEAN
 SMALLINT
 INTEGER
 FLOAT
 DATE
 TIME
 BLOB

25. Read
 Database:
 USE DatabaseName;
 Query:
SELECT column FROM table_name;
SELECT column1, column2, …, columnN FROM table_name;
SELECT * FROM table_name;

26. Update
 Query:
 UPDATE table_name SET column1 = value1, column2 = value2....,
columnN = valueN WHERE [condition];

27. Exercise

28. Delete
 Database:
 DROP DATABASE DatabaseName;
 Table:
 DROP TABLE table_name;
 Query:
 DELETE FROM table_name WHERE condition;

29. Exercise

30. Aggregate Functions
 Reference : https://www.w3schools.com/sql/sql_functions.asp
AVG() Returns the average value
COUNT() Returns the number of rows
FIRST() Returns the first value
LAST() Returns the last value
MAX() Returns the largest value
MIN() Returns the smallest value
ROUND() Rounds a numeric field to the number
of decimals specified
SUM() Returns the sum

31. Examples
 SELECT COUNT(*) FROM table_name;
 The COUNT(*) function returns the number of records in a table:
 SELECT COUNT(column_name) FROM table_name;
 The COUNT(column_name) function returns the number of values
(NULL values will not be counted) of the specified column
 SELECT AVG(column) AS averageOfCol FROM Products;
 Return the average of col and name it averageOfCol

32. Foreign Key
 A FOREIGN KEY is a key used to link two tables together.
 A FOREIGN KEY in a table points to a PRIMARY KEY in another table.
PersonID LastName FirstName Age
1 Hansen Ola 20
2 Svendson Tove 23
3 Pettersen Kari 21
OrderID OrderNumber PersonID
1 1321312 3
2 2131222 3
3 2311313 1
4 3311233 2

33. Foreign key
 CREATE TABLE Orders (
OrderID int NOT NULL PRIMARY KEY,
OrderNumber int NOT NULL,
PersonID int,
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID)
);

34. Dependent Table
 Table with no primary key
 Any record belong to another record in another table
PersonID Last Name First Name Age
1 Mohey Sandra 20
2 Samir Mohamed 23
3 Zakryia Noha 21
PersonID Children Name
1 Hamda Mohey
1 Tamer Mohey
2 Magdy Samir
2 Kenzy Samir

35. Exercise