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SQL JOIN with Example

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To select data from two or more table SQL join is used.

There are the different types of the JOINs in SQL:
  • INNER JOIN: Select the records that have matching values in both tables
  • LEFT JOIN: Select all records from the left table, and the matched records from the right table
  • RIGHT JOIN: Select all records from the right table, and the matched records from the left table
  • FULL JOIN: Select all records when there is a match in either left or right table

Inner join

left join

Right join

Full join

SQL JOIN Example

Assume that we have two table

students_data table

RollNo Name Address ContactNo
1 Divya Mumbai 9437911966
2 Hritika Pune 9887454545
3 Amit Delhi 7766888888

students_mark table

RollNo Mark Grade
1 95 O
2 85 A
3 65 B

Example

SELECT students_data.RollNo, students_data.Name, students_data.Address, students_mark.Marks, students_mark.Grade
FROM students_data
INNER JOIN students_mark ON students_data.RollNo = students_mark.RollNo;
RollNo Name Address Mark Grade
1 Divya Mumai 95 O
2 Hritika Pune 85 A
3 Amit Delhi 65 B
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