6. data modeling with sql server - c# and databases
DESCRIPTION
Database Modeling with SQL Server - Creating Databases and E/R Diagrams with SQL Server Management StudioTelerik Software Academy: http://academy.telerik.com/school-academy/meetings/details/2012/01/06/desktop-applications-csharp-databasesThe website and all video materials are in Bulgarian.Introduction to SQL ServerData Modeling – PrinciplesData Types in SQL ServerCreating Databases in SQL ServerCreating TablesDefining a Primary Key and Identity ColumnsCreating Relationships between the TablesOne-to-many, Many-to-many, One-to-oneNaming conventionsTRANSCRIPT
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C# and Databases free course
Svetlin Nakov
Telerik Software Academyhttp://academy.telerik.com/
Manager Technical Trainerhttp://www.nakov.com
/
Database Modeling with SQL Server
Creating Databases and E/R Diagrams with SQL Server Management Studio
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Table of Contents
1. Introduction to SQL Server
2. Data Modeling – Principles
3. Data Types in SQL Server
4. Creating Databases in SQL Server
5. Creating Tables
6. Defining a Primary Key and Identity Columns
7. Creating Relationships between the Tables
One-to-many, Many-to-many, One-to-one
8. Naming conventions 2
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MS SQL Server 2008Overview
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What is Microsoft SQL Server?
MS SQL Server is a Relational Database Management System (RDBMS) from Microsoft The main language supported in
SQL Server is Transact SQL (T-SQL), an extension of SQL
Powerful, trustworthy, easy-to-use DB server
The most recent version is SQL Server 2008
Works only on Windows systems A free distribution exists (SQL Server Express) http://www.microsoft.com/express/d
atabase/
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Connecting to SQL Server
Connecting to SQL Server requires The name of the server machine / IP
address
The name of the server instance
The name of the database
Username / password (if using SQL Server authentication)
Types of authentication in SQL Server Windows (by using a Windows user
credentials)
Mixed (both Windows and SQL Server)
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SQL Server Management
Studio (SSMS) SQL Server Management Studio (SSMS) is a powerful graphical DB management tool Administrate databases (create,
modify, backup / restore DB)
Create and modify E/R diagrams
View / modify table data and other DB objects
Execute SQL queries
Free and easy to use tool
Works with all SQL Server versions
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SQL Server Management Studio –
Screenshot
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SQL Server Databases
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System Databases
User Databases
model tempdb msdb distribution
pubs Northwind …
master
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SQL Server Databases Each SQL Server database consists of two files: .mdf file
Contains the core data in the database
Schema, tables data, and other database objects
.ldf file Transaction log – keeps track of
transactions
You need both these files to use the database
You can move a database by SQL scripting, backup / restore, or copy the .mdf/.ldf files
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SQL Server Management
StudioLive Demo
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Relational Data Modeling
Fundamental Concepts
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Steps in Database Design
Steps in the database design process:
1. Identification of the entities
2. Identification of the columns in the tables
3. Defining a primary key for each entity table
4. Identification and modeling of relationships
Multiplicity of relationships
5. Defining other constraints
6. Filling test data in the tables
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Identification of Entities
Entity tables represent objects from the real world Most often they are nouns in the
specification For example:
Entities: Student, Course, Town13
We need to develop a system that stores information about students, which are trained in various courses. The courses are held in different towns. When registering a new student the following information is entered: name, faculty number, photo and date.
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Identification of Columns
Columns in the tables are characteristics of the entities They have name and type
For example students have: Name (text)
Faculty number (number)
Photo (binary block)
Date of enlistment (date)
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Identification of the Columns
Columns are clarifications for the entities in the text of the specification, for example:
Students have the following characteristics: Name, faculty number, photo, date
of enlistment and a list of courses they visit
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We need to develop a system that stores information about students, which are trained in various courses. The courses are held in different towns. When registering a new student the following information is entered: name, faculty number, photo and date.
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How to Choose a Primary Key?
Always define an additional column for the primary key Don't use an existing column (for
example SSN) Must be an integer number Must be declared as a primary key Use identity to implement auto-
increment Put the primary key as a first
column Exceptions
Entities that have well known ID, e.g. countries (BG, DE, US) and currencies (USD, EUR, BGN)
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Identification of Relationships
Relationships are dependencies between the entities:
"Students are trained in courses" – many-to-many relationship
"Courses are held in towns" – many-to-one (or many-to-many) relationship
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We need to develop a system that stores information about students, which are trained in various courses. The courses are held in different towns. When registering a new student the following information is entered: name, faculty number, photo and date.
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Data Types in SQL Server 2008
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Data Types in SQL Server
Numeric bit (1-bit), integer (32-bit), bigint
(64-bit) float, real, numeric(scale, precision)
money – for money (precise) operations
Strings char(size) – fixed size string varchar(size) – variable size string nvarchar(size) – Unicode variable
size string text / ntext – text data block
(unlimited size)
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Data Types in SQL Server (2)
Binary data varbinary(size) – a sequence of bits
image – a binary block up to 1 GB
Date and time datetime – date and time starting
from 1.1.1753 to 31.12.9999, a precision of 1/300 sec.
smalldatetime – date and time (1-minute precision)
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Data Types in SQL Server (3)
Other types timestamp – automatically generated
number whenever a change is made to the data row
uniqueidentifier – GUID identifier
xml – data in XML format
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Data Types in SQL Server (4)
Nullable and NOT NULL types All types in SQL Server may or may
not allow NULL values Primary key columns
Define the primary key Identity columns
Automatically increased values when a new row is inserted (auto-increment values)
Used in combination with primary key
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Database Modeling with SQL Server
Management StudioCreating a Database
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Connecting to SQL Server
When starting SSMS a window pops up
Usually it is enough to just click the "Connect" button without changing anything
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Working with Object Explorer
Object Explorer is the main tool to use when working with the database and its objects
Enables us: To create a new database
To create objects in the database (tables, stored procedures, relationships and others)
To change the properties of objects
To enter records into the tables 25
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Creating a New Database
In Object Explorer we go to the "Databases" and choose "New Database…" from the context menu
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Creating a New Database (2)
In the "New Database" window enter the name of the new database and click [OK]
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Database Modeling with SQL Server
Management StudioCreating E/R Diagrams
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Creating an E/R diagram
In the "Database Diagrams" menu choose the "New Database Diagram"
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Database Modeling with SQL Server
Management StudioCreating Tables
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Creating Tables
If the database doesn't show immediately in Object Explorer perform "Refresh" [F5]
Creating new table:
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Creating Tables (2)
Enter table name and define the table columns (name and type):
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Enter the name of
the column
here
Choose the data type of the column
here
Choose whether
NULLs are allowed
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Creating Tables (3)
Defining a primary key
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Right click on the column start and
select "Set Primary Key"
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Creating Tables (4)
Defining an identity columns Identity means that the values in a
certain column are auto generated (for int columns)
These values cannot be assigned manually
Identity Seed – the starting number from which the values in the column begin to increase.
Identity Increment – by how much each consecutive value is increased
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Creating Tables (5)
Setting an identity through the "Column Properties" window
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Creating Tables (6)
It is a good practice to set the name of the table at the time it is created Use the "Properties"
window
If it's not visible use "View" "Properties Window" or press [F4]
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Tablename
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Creating Tables (7)
When closing the window for the table, SSMS asks whether to save the table You can do it manually by choosing
“Save Table” from the “File” menu or by pressing Ctrl + S
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Database Modeling with SQL Server
Management StudioCreating Relationships between Tables
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Creating Relationships To create one-to-many relationship drag the foreign key column onto the other table Drag from the child table to the
parent table
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Self-Relationships
Self-relationship can be created by dragging a foreign key onto the same table
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Database Modeling with SQL Server
Management StudioNaming Conventions
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Naming Conventions Tables
Each word is capitalized (Pascal Case)
In English, plural Examples: Users, PhotoAlbums, Countries
Columns In English, singular Each word is capitalized (Pascal
Case) Avoid reserved words (e.g. key, int, date)
Examples: FirstName, OrderDate, Price
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Naming Conventions (2)
Primary key Use "Id" or name_of_the_table + "Id"
Example: in the Users table the PK column should be be called Id or UserId
Foreign key Use the name of the referenced
table + "Id"
Example: in the Users table the foreign key column that references the Groups table should be named GroupId
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Naming Conventions (3)
Relationship names (constraints)
In English, Pascal Case
"FK_" + table1 + "_" + table2
For example: FK_Users_Groups
Index names
"IX_" + table + column
For example: IX_Users_UserName
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Naming Conventions (4)
Unique key constraints names "UK_" + table + column For instance: UK_Users_UserName
Views names V_ + name Example: V_BGCompanies
Stored procedures names usp_ + name Example: usp_InsertCustomer(@name)
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Database Modeling with SQL Server Management
StudioLive Demo
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Database Modeling with SQL Server
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