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Objective 5.01: Understand database tables used in business A database is a tool used to organize, store, retrieve, and communicate (report on) groups of related information. Sli de 2 • Business stock book inventory Online library card catalog • Barcode scanner ◦ Media Center information keeps inventory in ◦ Encyclopedias ◦ Dictionaries database eBay and other online • Real estate listings businesses • MLS listings online ◦ Inventory • Fingerprint database Telephone ◦ Keep track of customers, products, vendors, pay pal accounts Sli de 3 Payroll data ◦ Employee names ◦ Employee Social Security numbers ◦ Pay rates ◦ Exemptions Hospital/patient data Internet search engines databases iTunes ◦ Music Personal address book Student data (NCWISE), such as Student ID #’s Sli de 4 A database is a tool used by businesses to manage the huge amount of data required to run the business. ◦ For example, a business may use several databases to keep track of employee information, customers, products, and prices of products. ◦ All of the information can be easily and efficiently managed and shared by database software. Sli de 5 Databases consist of 4 main Objects: 1. Tables - store data in rows and columns 2. Queries - retrieve and process data 3. Forms - control data entry and data views A form is a customized manner of inputting data into a database or presenting data on a screen. 4. Reports - summarize and print data Sli de 6 Tables store data, so they are the essential building blocks of all databases. Tables--are used to group and organize the information within a database. All databases contain at least one table. ◦ Each database usually consists of one or more tables. Sli de 7 All databases should have a separate table for every major subject, such as employee records or customer orders. Tables organize data. Data should not be duplicated in multiple tables. Sli de 8 1. A Table is an arrangement of columns and rows. • A Table is the fundamental building block of all databases. • In a Database Table: • Rows called Records • Columns called Fields Sli de 9 2. An Entry is a single piece of data in a database table. • Data is made up of characters. • Data is typed into a Field as an entry. • Example: • Beverages is an entry in the Category Name field. Sli de 10 3. A Field is a grouping or category of similar information contained in a table. • A Field is represented by a COLUMN. • It is comprised of entries. • A Field is a unique identifier for a category of information. • It is one item or bit of information in a record. Sli de 11 4. A Record is a complete description of all of the fields related to one item in a table. • A Record – A group of related fields of information. • Everything on one row is a record. • A Record is a single piece of data in a database table. Sli de 12 Database Tables: The Big Picture 1. Table 2. Entries 3. Field 4. Record 4. RECORDS (rows) 3. FIELDS (columns) 2. ENTRIES (cells) To calculate the number of entries in a database--multiply the number of fields by the number of records. Ex. 5 fields(columns)*26 rows (records) = 130 entries in this database. Sli de 13 Name Birth date Social Security No. Street City State Zip Phone Each item on the left is classified as a/an: a) Table b) Record c) Field d) Entry Sli de 14 Susan Almond 10/22/1985 245-88-9845 31 Bessemer St. Greensboro NC 25233 336-585-5646 Each item on the left is classified as a/an: a) Table b) Record c) Field d) Entry Sli de 15 Susan Almond 10/22/1985 245-88-9845 31 Bessemer St. Greensboro NC 25233 336-585-5646 All of the information about Susan Almond is classified as a/an: a) Table b) Record c) Field d) Entry Sli de 16 Information about multiple employees is classified as a/an: a) Table b) Record c) Field d) Entry Sli de 17 Name Bday Almond 10/22/ , Susan 1985 SS 245889845 Street 31 Bessemer St City St Zip Greensbor NC 2523 o 3 Phone 3365855646 One record is displayed from the Employee Table above. The table contains 8 fields. Sli de 18