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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What happens if no column name matches?40 secDisclaimer. KwickAcademy is free study material for general learning and revision. Parts of it, including the voice-over, are produced with the help of AI tools and may contain errors; if you spot one, please tell us and we will correct it. Syllabus, marks and exam details follow the latest official board publications available to us, and boards can change them at any time, so always confirm against your board's official website and your school. Using this material does not guarantee any marks or result. Board names and trademarks belong to their owners; Kwickprep is not affiliated with or endorsed by any examination board. We never ask for passwords, OTPs or ID numbers. Your progress is saved only in this browser. Full disclaimer · Privacy