---
title: "How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?"  
description: "How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?"  
author: "Amit Singh"  
published: 2011-05-03  
updated: 2020-09-18  
canonical: https://www.mindstick.com/interview/820/how-to-implement-one-to-one-one-to-many-and-many-to-many-relationships-while-designing-tables  
category: "mssql server"  
tags: ["mssql server"]  
reading_time: 1 minute  

---

# How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?

One-to-One relationship can be implemented as a single table and rarely as two tables with primary and foreign key relationships.\
One-to-Many relationships are implemented by splitting the data into two tables with primary key and foreign key relationships.\
Many-to-Many relationships are implemented using a junction table with the keys from both the tables forming the composite primary key of the junction table.

## Answers

### Answer by Amit Singh

One-to-One relationship can be implemented as a single table and rarely as two tables with primary and foreign key relationships.\
One-to-Many relationships are implemented by splitting the data into two tables with primary key and foreign key relationships.\
Many-to-Many relationships are implemented using a junction table with the keys from both the tables forming the composite primary key of the junction table.


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Original Source: https://www.mindstick.com/interview/820/how-to-implement-one-to-one-one-to-many-and-many-to-many-relationships-while-designing-tables

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