KwickClips Databases and SQL · 41 sec · free
What makes a join an equi-join?
Short answer. An = condition on the common column.
Why write TABLE.column?
Because both tables have a column with that name.
Remember
| Use = on the common column |
| Write TABLE.column |
How do you keep only the correct pairs? Add a where condition. S is student and H is house. Keep rows where both house numbers are equal. That is an equi-join. Two rules. Use equals on the common column. Write table dot column.
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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