KwickClips Databases and SQL · 41 sec · free
Which relationship is most common?
Short answer. One-to-many.
What does many-to-many need?
A middle table.
Relationships
| Type | Example |
|---|---|
| 1 to 1 | locker |
| 1 to many | fee receipts |
| Many to many | subjects |
Remember
| 1 to many is most common |
| Many to many: middle table |
How can rows in two tables match? Take one student. One student has one locker. One student has many fee receipts. Many students take many subjects. Two tips. One to many is most common. Many to many needs a middle table.
This clip is from the full lesson: Relationships Between Tables in Base — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 10 Information Technology (402)
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