Financial Information Management FIM: Databases Stefano Grazioli

Debriefing  Still doing well  Lab  Easy meter

You are a financial analyst at a broker firm…. Many of our customers invest for short amounts of time on Google. They sell their shares within a few weeks…. I wonder: do they make any money out of it?

You do the talking  Name, major  Learning objectives  Things you like about the class  Things that can be improved  Strengths / Attitude towards the Tournament

Financial Information Management FIM: Databases Stefano Grazioli

Why do we need Databases?  Program (e.g., VBA) data is volatile  Data in one place for everyone to use  Indispensable in commerce

DBs vs. DBMSs  A database (DB) is an organized collection of data  A database Management System (DBMS) is a software that provides data-related functionality DBMS User or program DBMS: Access, Oracle, IBM DB2, SQL Server, MySQL... User or program ‘Client’ program Data center User location

DBs and the Web DBMS User or program Browser program Data center User location Web server

Relational DBMS When a DBMS organizes your data so that they appear to the users as TABLES, that DBMS is a Relational DBMS, or RDBMS. RDBMS Client program Is Excel a DB, a DBMS, a RDBMS?

Financial Information Management Congratulations! You are hired at SmallBank Homework

You are a Business Intelligence analyst at SmallBank Welcome! So glad that you are here and can help us with Business Intelligence! I have so many business questions for you… (1) Who are our customers in Austin, TX? I need a list of first names, last names and IDs (2) What are the rates that we offered on our loans? Prepare a report with the loan IDs and rates for the loans under $50,000,000 (3) …. Please access our MS SQL Server and create these reports for me…

Data center User location Accessing Business Data RDBMS MS SQL Server SmallBank data: Loan, Loan Officer, Customer, Insurance Plan SmallBank data: Loan, Loan Officer, Customer, Insurance Plan SQL Client Visual Studio F-sg6m-s4 Sql queries

Example Table: Loan Officer ACTUAL TABLE DIAGRAM LO id f name l name phone demo

Small Bank DB: Data Dictionary  Loan  l_id = the loan unique id  principal, rate, date_due,  Loan officer  lo_id = the loan officer’s unique id  f_name, l_name, phone  Customer  c_id = the customer’s unique id  f_name, l_name, city, state  Insurance plan  coverage = maximum amount covered  premium = amount to pay every year

Financial Information Management WINIT What Is New In Technology?

Financial Information Management SQL Queries

SQL  Structured Query Language  The standard language for databases  70s: - Codd - SEQUEL – Structured English QUEry Language  commercialized it in 1979  1986 ISO/ANSI  Sometimes sought as a required skill in interviews

SQL EXAMPLE: A QUERY SELECT First_Name, Last_Name, ssn FROM StudentTbl WHERE gpa > 3.0 ORDER BY Last_Name;

4+2 BASIC SQL COMMANDS  SELECT = ‘search’  INSERT a new row  UPDATE a existing row  DELETE a row  CREATE a table  DROP a table

Reading the Data Model Primary key: a unique identifier used to retrieve the record

One Many Reading the Relationships

Navigating the Relationships (‘join’) foreign key: a PK in another table, used to link the two tables FK

Joins are commonsense If I give you c_id ‘4977’, can you give me the phone numbers of the loan officers for that client?

SQL Query Select loan_officer.phone from customer_in_loan, loan, loan_officer where customer_in_loan.c_id = '4977' and customer_in_loan.l_id = loan.l_id and loan.lo_id = loan_officer.lo_id