Red Hat Junior Java Developer interview questions

Asked question covering various areas like : 1. SQL 2.JavaScript 3.HTTP methods 4. Java. 5. AngularJS Some of the questions were 1.What is an index in Sql? 2.What is outer join and inner join. 3.What is 'this' keyword in Javascript? 4.Name some interfaces in Java. 5. Explain why space complexity of HashMap is O(1) even as key value pairs are not stored in order. 6. What happens when we type say-'google.com' in the address bar. Walk me through what happens.How does the server get it. 7.what is use strict in JavaScript? 8. What is your project? and Why?