Prev Next

Database / SQL

Explain different types of SQL joins.

There are different types of joins available in SQL:

INNER JOIN: returns rows when there is a match in both tables.

LEFT JOIN: returns all rows from the left table, even if there are no matches in the right table.

RIGHT JOIN: returns all rows from the right table, even if there are no matches in the left table.

FULL JOIN: combines the results of both left and right outer joins.

The joined table will contain all records from both the tables and fill in NULLs for missing matches on either side.

SELF JOIN: joins a table to itself as if the table were two tables, temporarily renaming at least one table in the SQL statement.

CARTESIAN JOIN: returns the Cartesian product of the sets of records from the two or more joined tables.

More Related questions...

SQL to find 2nd highest salary in the Employee table. Difference between RANK and DENSE_RANK functions in SQL. Default behavior of NULL on ORDER BY Clause in SQL. How do I order NULLS first while performing ascending order in SQL? What is ROWID in SQL? Explain ROWNUM in Oracle. How the ROWNUM to be used together with the ORDER BY clause in SQL? What is Correlated subquery in SQL? What is cardinality? Explain bind variable in SQL. What is B-tree index? What is Clustered Index in SQL? What is NonClustered Index in SQL? Explain index in database. Explain composite index in database. What is self join In SQL? Explain ACID properties of database transactions. Difference between a super key and a candidate key. What is super key in database? What is the equivalent of GO statement in MySQL? Different types of JOIN in SQL. What is a cross join in SQL? Explain SQL SELF JOIN. Difference between primary key and unique key. Difference between view and materialized view in SQL. How do I find number of queries issued per hour in MySQL? Disadvantages of SQL indexing. Advantages of using SQL Index. Types of SQL index. Can a view have same name as table under same tablespace? What is the simplest way to find the second largest value using SQL? Hi, I am Vinay, My question is how to create Empid (ex:Empid: TCS-456) and to save in Mysql BD, if next, I enter other then it should be incremented like Empid: TCS-456/7/8/9..etc. What is the difference between Truncate & Delete? How do you find the second highest salary from a table? Explain different types of SQL joins. Different subsets of SQL. What are SQL constraints? SQL to find the 3rd highest salary. How to best display in Terminal a MySQL SELECT returning too many fields? Write a SQL query to display employee name, and salary where the salary is highest for each manager.
Show more question and Answers...

MongoDB Interview questions

Comments & Discussions

Interviews Questions

About Javapedia.net

Javapedia.net is for Java and J2EE developers, technologist and college students who prepare of interview. Also this site includes many practical examples.

This site is developed using J2EE technologies by Steve Antony, a senior Developer/lead at one of the logistics based company.

Follow Javapedia updates

contact: javatutorials2016[at]gmail[dot]com

Kindly consider donating for maintaining this website. Thanks.

Copyright © 2026, javapedia.net, all rights reserved. · .

DMCA.com Protection Status