Fragen im Vorstellungsgespräch: Senior software engineer in Hamburg

Abstraction:- Data abstraction refers to, providing only essential information to the outside world and hiding their background details, i.e., to represent the needed information in program without presenting the details. For example, a database system hides certain details of how data is stored and created and maintained. Similar way, C++ classes provides different methods to the outside world without giving internal detail about those methods and data. Interface An interface is a reference type in Java. It is similar to class. It is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface. Along with abstract methods, an interface may also contain constants, default methods, static methods, and nested types. Method bodies exist only for default methods and static methods.

The differences are both theoretical and practical: 1) interface is a description of some capability your class has and advertises (so various classes implementing the same interface can be used the same way) 2) abstract class can be a default implementation, containing the parts which are likely to appear in all the implementations. It doesn't have to implement the complete interface

Everything was on German which was little bit confusing for me.

A mechanism to pass down data to the children.

1.How to select all the even number records from a table? 2.How to fetch values from TestTable1 that are not in TestTable2 without using NOT keyword? 3.What is the command used to fetch the first 5 characters of a string?

Design Patterns in Laravel. 1) The Builder (Manager) pattern. 2) The Factory pattern. 3) The Repository pattern. 4) The Strategy pattern. 5) The Provider pattern. 6) The Facade pattern

Star schema is the fundamental schema among the data mart schema and it is simplest. This schema is widely used to develop or build a data warehouse and dimensional data marts. It includes one or more fact tables indexing any number of dimensional tables. The star schema is a necessary case of the snowflake schema. It is also efficient for handling basic queries. It is said to be star as its physical model resembles to the star shape having a fact table at its center and the dimension tables at its peripheral representing the star’s points.

I coded solutions for all four tasks.