Check out example codes for "join three tables sql". It will help you in understanding the concepts better.

Code Example 1

SELECT s.studentname
    , s.studentid
    , s.studentdesc
    , h.hallname
FROM students s
INNER JOIN hallprefs hp
    on s.studentid = hp.studentid
INNER JOIN halls h
    on hp.hallid = h.hallid

Code Example 2

Suppose we are having three table named as 
Student_details
Attendance_details
Batch_details
And we have to apply join these three tables for fetching records

Example query:
select column_names
from Student_detail as s join Attendance_details as a on
s.s_id = a.s_id join Batch_details as b on 
s.s_id = b.s_id;

Here in the above example we implemented simple join but you change it with own join requirements.

Code Example 3

SELECT column-names
  FROM table-name1 JOIN table-name2 
    ON column-name1 = column-name2
 WHERE condition

Code Example 4

SELECT column_name(s)
FROM table1
INNER JOIN table2
ON table1.column_name = table2.column_name;

Code Example 5

SELECT TableA.*, TableB.*, TableC.*, TableD.*
FROM TableA
    JOIN TableB
        ON TableB.aID = TableA.aID
    JOIN TableC
        ON TableC.cID = TableB.cID
    JOIN TableD
        ON TableD.dID = TableA.dID
WHERE DATE(TableC.date)=date(now())

Code Example 6

SELECT Orders.OrderID, Customers.CustomerName
FROM Orders
INNER JOIN 
  Customers ON Orders.CustomerID = Customers.CustomerID;

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