How to find all the relations between all mysql tables?

Question

How to find all the relations between all MySQL tables? If for example, I want to know the relation of tables in a database of having around 100 tables.

Is there any

Answer 1

1) Go into your database:
use DATABASE;

2) Show all the tables:
show tables;

3) Look at each column of the table to gather what it does and what it's made of:
describe TABLENAME;

4) Describe is nice since you can figure out exactly what your table columns do, but if you would like an even closer look at the data itself: select * from TABLENAME
If you have big tables, then each row usually has an id, in which case I like to do this to just get a few lines of data and not have the terminal overwhelmed:
select * from TABLENAME where id<5 - You can put any condition here you like.

This method give you more information than just doing select * from INFORMATION_SCHEMA.TABLE_CONSTRAINTS;, and it also provides you with more bite-sized information each time.

EDIT

As the comments suggested, the above WHERE id < 5 was a bad choice as a conditional placeholder. It is not a good idea to limit by ID number, especially since the id is usually not trustworthy to be sequential. Add LIMIT 5 at the end of the query instead.