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Left join in SQL and DBMS

Left join in SQL and DBMS

Today, in this fresh and new article, we will cover the following topics;

  1. What is left join?
  2. Example of left join
  3. Query of left join

Left join shows all rows from the left table and shows only matching rows from the right table.


Table: Exams

Inner join shows results from both tables where there is any match between columns in both tables.


Table: Accounts

Now, we have two different tables. If we want to show the record of both tables in one single table then we can use a left join to join both two tables.

Query of left join

SELECT Exams.RegistrationNo, Exams.Marks, Accounts.Fee FROM Exams LEFT JOIN Accounts ON Exams.RegistrationNo =  Accounts.RegistrationNo


Table: Table generated after Left Join


Test Your Understandings

1. Left join shows some rows from left table ? YES / NO

Answer - Click Here:
No, its show all rows

2. Left join shows all rows from Right table? YES / NO

Answer - Click Here:
No, it can only show matching rows from right table.

3. SELECT Exams.Marks, Accounts.Fee FROM Exams LEFT JOIN Accounts?

In this query, exams are the right table and accounts is the left the table.


Answer - Click Here:
No, exams is left table

Topic Covered

Left join in SQL and DBMS.

Fazal Rehman Shamil Click Here to Know More
Instructor, Researcher, Blogger, SEO Expert, Poet and Publisher of International Journal Of Software, Technology & Science ISSN : 2616 - 5325
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