KwickClips Databases and SQL · 40 sec · free
What is inconsistency?
Short answer. Copies of the same data that no longer agree.
Why does it happen with files?
Each office keeps its own unlinked copy.
Same data, three files
| File | City |
|---|---|
| Teacher | Surat |
| Library | Ahmedabad |
| Transport | Ahmedabad |
Remember
| Redundancy: data repeated |
| Inconsistency: copies differ |
Riya moved to Surat. Why did the bus go to Ahmedabad? Three files store her city. Only the teacher's file says Surat. Library and transport still say Ahmedabad. Redundancy means data is repeated. Inconsistency means copies differ.
This clip is from the full lesson: Why Databases: Data, Information and the DBMS — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 10 Information Technology (402), CBSE Class 12 Computer Science (083), CBSE Class 11 Informatics Practices (065), CBSE Class 12 Informatics Practices (065)
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