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MySql-Interview-questions-->View question

How to join three tables in MySQL?

MySQL Interview Questions


Asked On2021-12-28 12:37:29 by:Akhil-Dev-D

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We can use joins to combine the tables.
Ex:-
SELECT
  student.first_name,
  student.last_name,
  course.name
FROM student
JOIN student_course
  ON student.id = student_course.student_id
JOIN course
  ON course.id = student_course.course_id;

Answerd on:2021-12-28 Answerd By:Rangaswamy-G-L

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Here is a general SQL query syntax to join three or more tables. This SQL query should work in all major relational databases like MySQL, Oracle, Microsoft SQLServer, Sybase, and PostgreSQL:

SELECT t1.col, t3.col
FROM table1
JOIN table2 ON table1.primarykey = table2.foreignkey
JOIN table3 ON table2.primarykey = table3.foreignkey


We first join table 1 and table 2 which produce a temporary table with combined data from table1 and table2,  which is then joined to table3. This formula can be extended to more than 3 tables to N tables, You just need to make sure that the SQL query should have N-1 join statement in order to join N tables. for joining two tables, we require 1 join statement and for joining 3 tables we need 2 join statements.

Here is a nice diagram that also shows how does different types of JOINs e.g. inner, left outer, right outer and cross joins works in SQL:

How to join three tables in SQL with MySQL database example



Answerd on:2022-01-06 Answerd By:Muskan-Kumari

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