What is the maths behind JOINS in SQL ?

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I am learning sql and I wonder what kind of maths goes on behind the scene in sql when we apply Joins in sql.

What I have tried:

I tried google , but didnt find related answers

Posted 24-Aug-20 3:06am

Deepesh mhatre

Updated 24-Aug-20 3:32am

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CHill60 · Answer 1 · 2020-08-24T03:32:00

Solution 1

It's set theory - Set theory - Wikipedia[^]

See this CP article - Visual Representation of SQL Joins[^]

You can get a better understanding of any individual query by looking at its Execution Plan[^]

Posted 24-Aug-20 3:32am

CHill60

Comments

Wendelius 24-Aug-20 11:09am

Seconded!