Creating A Database

1. 3 SQL SERVER: CREATINGA DATABASE

2. Creating a SQL Server Database STEPS IN CREATING A DATABASE IN 3 SIMPLE STEPS Understand the problem. Think of the essential data elements which are to become a part of the database Create the database using the SQL server 2008 – Command Prompt Feed data into the database Lets take a look at how this can be done

4. Type of the Item

5. CostWe need not bother about the ‘less’ significant data like ISI certificate number or the Ingredients from a daily-user’s perspective Bottom-line: Take the important stuff, ignore the rest.

6. Step 2: Create the database The Next step is to create the database schema. The schema (pronounced as skee-ma) is the structure of the database, which is described in a DBMS language like SQL. For the Grocery-Database, the schema of a table of items may look like: The Item number is a key, i.e., it is used to uniquely locate a product in a database.

7. Step 2: Create the database Searching a DB Without a Primary Key: NOT EFFICIENT Computer: Now which out of these do you need? User: Search for ‘Milk’ Database is searched and 2 entries match

8. Step 2: Create the database Searching a DB witha Primary Key: EFFICIENT Computer: I got it!  User: Search for Item with ID 102 Database is searched and 1 entry matches DB With a Primary Key Hence, always include primary keys in your DB deign

9. Step 2: Create the database Creating the DB using SQL Server 2008 – Command Prompt

10. Step 2: Create the database The SQL Language consists of 3 major subsets, based on the nature of the commands:

13. Eg: Product ID: 2324234

14. Float (decimals)

15. Eg: CGPA: 9.23

16. Varchar2 (Strings)

17. It stands for ‘Variable length Character’

18. Eg: Name: ‘Jonathan’

19. Date:

20. DateOfBirth: 31-12-2009(Format: dd-mm-yyyy)

21. Step 2: Create the database For example, consider a Grocery Item database: Field Type: Number Field Type: String Field Type: Float (Decimal) Field Type: Date So, command for creation would be: create table itemlist (ItemID number, ItemName varchar2(15), cost float, dataofpurchase date); NOTE: Dont worry about the ‘case’ of the field-names. SQL is case insensitive.

22. Step 2: Create the database 3. Runthe Command In the SQL Command prompt, after typing the command: create table <table-name> ( <fieldNamefieldTpye>,…); 1> Type ‘GO’ and press ENTER to run the SQL Server command: 1> create table <table-name> ( <fieldNamefieldTpye>,…); 2> go