Course Goals Introduce Terms Skills –Modern DBMS (SQL Server 2008) –SQL querying and data access –Stored procedures including parameters –Brief introduction to using code to interact with dbms

Information Resource Management What is a Database? Database vs. DBMS What are the Advantages of the Database Approach?

Retail Sales with Computer System and Bar Codes “What Happens when you bar-code a can of beans at Walmart? Initial Goal: improve speed & accuracy of checkout –Wipe barcodes to get product ID –Look up price –Calculate total amount

But with this information, we can do much more Reduce Errors –Happier customers Less skilled checkout people –No need to type #s or memorize prices Can change prices much faster Checkout efficiency –Credit Check –How fast people working Automatic Inventory Control –JustInTime Wholesale ordering – fedex option –Reduced inventory costs –Tax calculations for inventory Automatic Floor space v. sales calculations

What Business Functions Represented by This Function? Sales and Marketing Logistics Operations Human Recourses Management Accounting

Information Systems Management Data –Raw facts Information –Processed to be useful to particular users

What is a Database? A database is a shared collection of logically related data to help multiple particular users solve multiple particular problems, possibly in the future, and as yet unknown A database management system (DBMS) is a tool to access a database

Vision Database that contains ALL corporate data

Hard to achieve in practice Department DBs already exist –Older non-homogeneous software Even if not, have to start at department level to keep tractable Many often unwilling to start over –Ego & $$ Different data organization and data dictionary –E.g. how to store a name Extra work for some departments so other departments can do their job better –Turf wars

Function of CIO Operations Management –Scheduling, Capacity planning, Operations security, Disaster recovery Quality Assurance Communications Management –Local/Wide area, Long haul Data Resources Management –Data analysis, Database design, Data administration, Database Administration Project Management Corporate-Wide IS planning Information Center Systems development and Maintenance

Centralized Database All data at a single site –Personal computer –Central Corporate database (big iron) –Client/Server on network

DB Analysts and DB administration have to understand how organization works DB analyst a good path to becoming a CIO Requires both solid business AND technical skills including coding and complex query writing.

SQL Server Basics (Chapter 1) Overview of Database Objects –Database itself –Transaction log –Tables –Filegroups –Diagrams –Views

Overview of Database Objects Indexes Assemblies Reports Full-text Catalogs User-defined data types –e.g. ‘zip code’ instead of char(9) Roles Users

Four System Databases Master –Contains meta data about other databases including user-defined databases Model –Template for creating of user-defined DBs Tempdb –Working area for server Don’t touch any of these

MS Sample Databases AdventureWorksDW Pubs Northwinds We will use pubs and northwind as examples in this class

Transaction Log Transaction is a set of operations that must happen together (more on this later in the course) Actions first written to transaction log. When that is complete, operations applied to database. Rollback and data recovery

Objects within a Particular DB Table Index –Clustered and non clustered Triggers Constraints Filegroups –All tables default to single file, but can be changed to multiple files, disks, RAIDS, etc

Objects within a Particular DB Diagrams (page 9) –Diagram to DB –DB to diagram (!!!) –Views Hard to update –Stored procedures (e.g. subs w/ parameters) –User-defined functions –Users and Roles –Rules –Defaults –User-defined data types –Full-text (images?)

SQL server data types See table page 12 Note –Varchar –Nvarchar –Unique identifier –Conversion matrix

NULLS (page 17) Means ‘don’t know’ but might also mean ‘not applicable’ – no way for others to tell Nulls are BAD Poor DB design sometimes leads to nulls! –If your database design requires nulls you are doing something wrong

NAMES To know something’s true name is to be able to control it (once and future king) Everything in sql server has a name (pg 17) SQL server naming rules (pg 18) My naming rules –Relations are plural –Attributes are generally singular –All lowercase –No SPACES!!! Or underscores (innercap)