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Databases Your Phone Bill is a database ….

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Presentation on theme: "Databases Your Phone Bill is a database …."— Presentation transcript:

1 Databases Your Phone Bill is a database …

2 m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

3

4 Flat File m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

5 CALLS CUSTOMERS m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

6 Entities Relationships One to many Records Tables m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

7 CALLS CUSTOMERS m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

8 CALLS CUSTOMERS SELECT ALL from CUSTOMERS, CALLS where Customers.number = calls.number and call.number=5556453 m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

9 Finding Entities and Relationships 1946 Foreign Office List – service histories People, postings, etc What are the Entities? The relationships? Draw an ER Diagram m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

10 Sample solutions to ER Diag exercise m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

11 1901 Census of Ireland m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

12 1901 Census Forms m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

13 1901 Census Forms m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

14 Here’s one I prepared earlier.. 1901 Census in LibreOffice Base Parts of Database Tables Queries Forms Reports m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

15 Query By Example Show QBE m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

16 Structured Query Language m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

17 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? m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

18 SQL Exercise m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

19 Hollerith, 1890 Census, Hollerith Cards m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

20 Coding, Datatypes m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

21 Coding exercise m.cosgrave@ucc.ie www.mikecosgrave.com @mikecosgrave

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