1 Poor Preplanning
2 Failure to Understand the Purpose of the Data
3 Inadequate Normalization
4 Redundant Records
5 Poor Indexing
6 A Single Table for All Domain Values
7 Poor or Inconsistent Naming Conventions
8 Poor Documentation
9 Inadequate Testing
https://likegeeks.com/database-design-mistakes/
Regards,
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