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Databases
Your Phone Bill is a database…
[email protected] www.mikecosgrave.com @mikecosgrave
[email protected] www.mikecosgrave.com @mikecosgrave
Date Time Number Calling Duration
08-02-12 14:15 5556453 5551234 2:20
[email protected] www.mikecosgrave.com @mikecosgrave
Flat File
Date Time Number Calling Duration20-10-11 16:39 5556453 5551234 2:20
20-10-11 17:10 5556453 5553456 1:23
20-10-11 17:12 4443456 4356324 2:14
20-10-11 17:12 2345873 0044202345 1:43:15
21-10-11 02:12 4567432 5679876 2:14
21_10_11 02:15 4567432 5679876 3:45
21-10-11 08:43 4536857 189056789 3:10
[email protected] www.mikecosgrave.com @mikecosgrave
Date Time Number Calling Duration20-10-11 16:39 5556453 5551234 2:20
20-10-11 17:10 5556453 5553456 1:23
20-10-11 17:12 4443456 4356324 2:14
20-10-11 17:12 2345873 0044202345 1:43:15
21-10-11 02:12 4567432 5679876 2:14
21_10_11 02:15 4567432 5679876 3:45
21-10-11 08:43 5556453 189056789 3:10
Name House Street Town County Number5556453
CALLS
CUSTOMERS
[email protected] www.mikecosgrave.com @mikecosgrave
• Entities• Relationships• One to many• Records• Tables
[email protected] www.mikecosgrave.com @mikecosgrave
Date Time Number Calling Duration20-10-11 16:39 5556453 5551234 2:20
20-10-11 17:10 5556453 5553456 1:23
20-10-11 17:12 4443456 4356324 2:14
20-10-11 17:12 2345873 0044202345 1:43:15
21-10-11 02:12 4567432 5679876 2:14
21_10_11 02:15 4567432 5679876 3:45
21-10-11 08:43 5556453 189056789 3:10
Name House Street Town County Number5556453
CALLS
CUSTOMERS
[email protected] www.mikecosgrave.com @mikecosgrave
Date Time Number Calling Duration20-10-11 16:39 5556453 5551234 http://
www.census.nationalarchives.ie/reels/nai000888383/
20-10-11 17:10 5556453 5553456 1:23
20-10-11 17:12 4443456 4356324 2:14
20-10-11 17:12 2345873 0044202345 1:43:15
21-10-11 02:12 4567432 5679876 2:14
21_10_11 02:15 4567432 5679876 3:45
21-10-11 08:43 5556453 189056789 3:10
Name House Street Town County Number5556453
CALLS
CUSTOMERS
SELECT ALL from CUSTOMERS, CALLS where Customers.number = calls.number and call.number=5556453
[email protected] www.mikecosgrave.com @mikecosgrave
Finding Entities and Relationships
1946 Foreign Office List – service historiesPeople, postings, etcWhat are the Entities? The relationships?Draw an ER Diagram
[email protected] www.mikecosgrave.com @mikecosgrave
Here’s one I prepared earlier..1901 Census in LibreOffice BaseParts of Database• Tables• Queries• Forms• Reports
[email protected] www.mikecosgrave.com @mikecosgrave
Interrogating data• Individuals• Families• Buildings
– Landholder– Class of Building– List of specific out buildings
• So how would you dig out– Literacy by Age?– Literacy by occupation?– Literacy by homeownership?– Religion and home ownership?– Children not in school?– Live in servants?– Servants and class of house?
