KwickClips Databases and SQL · 42 sec · free
Why avoid one big table?
Short answer. It repeats data and invites mistakes.
What links two tables?
A common column.
Split the data
| Each house name stored once |
| Fewer typing mistakes |
| Rename in one place only |
Remember
| Split tables avoid repetition |
| A common column links them |
Why do databases use many tables? One big table repeats data. Split tables store each house once. Fewer typing mistakes. A rename happens in one place. Two ideas. Split tables avoid repetition. A common column links them.
This clip is from the full lesson: Working with Two Tables: Cartesian Product, Equi-join and Natural Join — 7 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 12 Informatics Practices (065), CBSE Class 12 Information Technology (802)
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