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Data Modeling A Scheduling Application
Adam Hutson Data Architect, DataScale Inc.
© DataStax, All Rights Reserved.
Who am I & What do we do?
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Adam Hutson Data Architect @ DataScale -> www.datascale.io DataStax MVP for Apache Cassandra DataScale provides hosted data platforms as a service Offering Cassandra & Spark, with more to come Currently hosted in Amazon & Azure
Data Modeling Stages
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Data Modeling Stages
• Maps concepts, relationships, & constraints
• Consists of entity classes with
characteristic attributes
• Nothing to do with a database
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© DataStax, All Rights Reserved.
Data Modeling Stages
• Maps concepts, relationships, & constraints
• Consists of entity classes with
characteristic attributes
• Nothing to do with a database
5
• Entities become tables
• Attributes become columns/
fields
• Relationships become key
• Entity Relationship Diagram
© DataStax, All Rights Reserved.
Data Modeling Stages
• Maps concepts, relationships, & constraints
• Consists of entity classes with
characteristic attributes
• Nothing to do with a database
6
• Entities become tables
• Attributes become columns/
fields
• Relationships become key
• Entity Relationship Diagram
• Applies constraints of chosen database
• Table structure using syntax
• Data types, keys, relationships
© DataStax, All Rights Reserved.
Data Modeling Stages
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© DataStax, All Rights Reserved.
Data Modeling Stages
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Data Modeling Stages
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Scheduling Application
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Scheduling Application DefinitionWhat is it?
Application to schedule service appointments.
Who is it for? Any employee of the service company.
What does it do? Sets & retrieves appointments for service. Client/Service detail requests. Provider/Service detail requests. Services delivered/scheduled over time.
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Conceptual Model
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Conceptual Model
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Logical Model
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Logical Model
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Desired Queries
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Desired Queries
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• Add new client information
• Get client info by name or phone
• Create appointment for specific date/time, client, service, & service technician
• Get all scheduled appointments for specified client name or phone
• Get all available times to schedule appointment for specified service & service technician
• Get all scheduled appointments for specified service technician
Physical Model
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Physical Model
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Add new client information
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Physical Model
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Add new client information
© DataStax, All Rights Reserved.
Physical Model
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Get client info by name or phone
© DataStax, All Rights Reserved.
Physical Model
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Get client info by name or phone
© DataStax, All Rights Reserved.
Physical Model
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Create appointment for specific date/time, client, service, & service technician
© DataStax, All Rights Reserved.
Physical Model
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Create appointment for specific date/time, client, service, & service technician
© DataStax, All Rights Reserved.
Physical Model
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Get all scheduled appointments for specified client name or phone
© DataStax, All Rights Reserved.
Physical Model
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Get all scheduled appointments for specified client name or phone
© DataStax, All Rights Reserved.
Physical Model
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Get all available times to schedule appointment for specified service & service technician
© DataStax, All Rights Reserved.
Physical Model
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Get all available times to schedule appointment for specified service & service technician
© DataStax, All Rights Reserved.
Physical Model
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Get all scheduled appointments for specified service technician
© DataStax, All Rights Reserved.
Physical Model
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Get all scheduled appointments for specified service technician
© DataStax, All Rights Reserved.
Physical Model
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End Product: A complete script to create your entire Data Model in Cassandra
