The relationship between a Customer and Orders is generally a

Question

BlackTom AI · Accepted Answer

A single customer typically can place multiple orders, so the relationship is One-to-Many.

1) Relevant knowledge points and concepts
- Cardinality in database relationships describes how many instances of one entity relate to instances of another.
- One-to-Many (1:N): one record in the first table relates to zero, one, or many records in the second table.
- Many-to-One is the inverse perspective (from the many side).
- Many-to-Many requires a junction table because multiple records on both sides can relate to multiple on the other.
- One-to-One means each record in both tables pairs with at most one record in the other.

2) Step-by-step reasoning
- Consider real-world semantics: one customer (a person or account) can place multiple orders over time (order #1, order #2, ...).
- Each individual order is normally linked to exactly one customer who placed it.
- Therefore the mapping from Customer → Orders is one (customer) to many (orders); from Orders → Customer it is many-to-one.

3) Illustrative mapping and schema (intermediate steps)
- Example mapping: Customer C1 → {Order O1, O2, O3}; Customer C2 → {O4}
- Relational schema: Customer(CustomerID PK, Name, ...) and Orders(OrderID PK, CustomerID FK, Date, ...)
- Orders.CustomerID references Customer.CustomerID, allowing multiple Orders rows to share the same CustomerID.

4) Why the correct answer is correct
- The definition and example show one Customer can be associated with multiple Order records, matching the One-to-Many pattern directly. The foreign key on Orders enforces this multiplicity.

5) Why the other options are incorrect
- Many-to-Many: would imply orders can belong to multiple customers and customers to multiple orders simultaneously (not typical); that pattern requires a junction table and does not model standard ordering.
- One-to-One: would mean each customer has at most one order, which contradicts real-world behavior.
- Many-to-One: describes the relationship from the Orders perspective (many orders to one customer) but is not the phrasing asked; the conventional description for Customer → Orders is One-to-Many.

6) Conclusion
The correct relationship is One-to-Many, which matches the provided answer: One-to-Many Relationship.

The relationship between a Customer and Orders is generally a 单项选择题

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