1. ACF5904 AIS
Tutorial 4

2. What we learnt so far in terms of system thinking skills development?
Translate to BPMN language
BPMN Models
Given Case Study Texts
Translate to Logical Data Model Using UML
UML Data Models
Translate to Physical Data Model Using MS Access ER Language
MS Access ER Data Models
Populate the MS Access Data Base with imported Excel tables
MS Access Database
Using MS Access Query Language to extract reports from the database
MS Access Query Results

3. MS Access Query Language

4. 2 ways of constructing MS Access Queries
Using the Query Language itself
Using the Query Wizard which guides you to construct short phrases to complete a query statement.
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5. More Complex Query Constructs
Construct Query Statement
Query Results
They are also data files or tables
Combine with other Query Results or MS Access Database Tables
Complex Query Results

6. Query Wizard Prompts: What do they mean?
Table Views: Select the data files/tables you intend to use to develop the query statement.
The data files can also be saved queries, not just database tables
Field : Ask you which fields (column by column) you want to include in data manipulation
Table : where each stated fields are sourced from
Sort – which stated field you want to sort
Show – which stated field you want to display
Criteria – what data manipulation / calculation actions you want to apply on the stated fields
Or – any alternative actions you want to include in data manipulation/calculation

7. Last Week Lecture More process modelling techniques
BPMN – more new notations – sub-processes, error events
DFD process modelling language and its notations, levels of process modelling – context, logical & physical levels
ERP Sales Processes via the Sunset case study

8. The Concept of Linking Tables
Logical Data Model in UML
Phyical Data Model in MS Access
Foster Parent
0..*
Cares
0..*
Orphan Child
Foster Parent
Orphan Child
1..1
1..1
Linking Table
Cares
Foster-Cared
Orphan Child
One foster parent cares for 0..* children
One child is cared by 0..* foster parent
0..*
0..*
Physical Database Systems cannot handle many-to-many relationships and need the construct of “linking tables” to integrate this many-to-many relationships
In other words, MS Access would implement the above physical data model, to reflect what is specified/required by the UML Data Model.
In the linking table, the key is make up of 2 foreign keys: Foster Parent ID + Orphan Child ID