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danny horan in Galway, Ireland

77 months ago

Could someone please give me answers to thses 2 questions, its very important. any help would be great.

Explain using examples what is meant by
• Primary Key
• Foreign Key
• Entity integrity
• Referential integrity

Describe, using examples where appropriate, when you would use each of the
following process specification methods:
• Structured English
• Decision Table

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Rob

72 months ago

It's all database terms.

Primary key is the main key for a table.
Foreign key is a field that relates to the primary key in another table.
Entity integrity means that all of the related records are correct and complete.
Referential integrity means that all of the key values are correct and complete.
Structured English is a textual description of a state or process.
Decision Table lists all of the various combinations of the inputs along with the action to take for each combination.

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