Question

Can a database contain two identical records without any negative effect on the integrity of the database? Why and why not?

Answer 1

Answer:

Yes, a database can contain two identical records. Structure of the database/table decides whether identical records impose negative effect on the integrity. If database table don't have any defined key or other 'unique' constraints, then we can have multiple identical records while opposite is not true.

Answer 2

Yes,  a database contain two identical records without any negative effect on the integrity of the database if the table has no constraints.

• The database's or table's structure will determine this.
• The answer is "Yes" if the table has no defined constraints because the database will not be negatively impacted by having multiple identical records.
• The answer is "No" if the table has a defined constraint, such as a Primary Key or Unique Key, because the integrity of the database would be compromised if there were any instances of duplicate, identical records in the database when a constraint existed.
• A database administrator employs procedures to guarantee data integrity, such as:
• Data backup, which keeps a copy of the data in a different location, and data encryption, which encrypts data to lock it by cypher
• Access controls, including read/write privilege assignments
• Data validation, to confirm uncorrupted data - Input validation, to prevent incorrect data entry.

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