Programming VIP

1. Design background Recently, some users have put forward the need to implement a set of video learning module and online examination module in the original website. Here, I will first introduce the design idea of the following online examination module. To realize an online examination system with basic functions, the following elements are ...

Big data has to mention the most useful weapon Hadoop. This article is the fastest way for you to get started with Hadoop. Hadoop has a quick introduction and a perceptual understanding, which can also be used as a quick index of steps. This article solves the following problems: Understand what Hadoop isWhat is Hadoop used for and how to use ...

share Big data blog list explain I have always been interested in the knowledge of Flink Table. Now I decide to go beyond some unnecessary knowledge and learn Flink Table directly. This paper mainly introduces the architecture and interface implementation of Flink Table.Apache Flink has two relational APIs for unified stream batch proces ...

Introduction: in the morning, I received a text message with the content of "Dear Hello, XXX". At that time, I smiled. It's a joke that programmers can Get. It shows that the program doesn't Get my name correctly from the database, and then formats the null value as null. To get back to business, the reason for this situation i ...

1, Introduction    the Java 8 API adds a new abstraction called stream, which allows you to process data in a declarative way, similar to the intuitive way of querying data from the database with SQL statements to provide a high-level abstraction for Java collection operation and expression. The stream API regards the collection ...

l) collection website [scene description] collect the latest second-hand house information in the world. [website] https://tj.esf.fang.com/ [collection content] Collect the title, price, house type, area, unit price, orientation, floor, decoration, community, region, contact person and telephone number of all second-hand houses in the secon ...

preface How to make statistical analysis for multiple band values? You can use the reduceRegions function Image.reduceRegions(collection, reducer, scale, crs, crsTransform, tileScale) Apply the reducer on the area of each feature in a given set. The input number of reducer must be the same as the number of bands of the input image. Return t ...

I have encountered a lot of mistakes in practicing es recently. Now write down the problems for later review and summary I won't repeat the process of installing es here. If you need the whole process of installing es, you can leave a message. If there are more, I'll write another detailed installation step Problem 1. Enter the es installatio ...

Pyspark establishes Spark RDD Each RDD can be divided into multiple partitions. Each partition can be regarded as a data set fragment and can be saved to different nodes in the Spark clusterRDD itself has fault-tolerant mechanism and is a read-only data structure, which can only generate new RDD through transformation; An RDD can be proces ...

preface The series of articles is more suitable for non science students. From shallow to deep, step by step, and embark on the road of big data from the foundation Let's work together to achieve our goals and realize our ideals Finally, please leave your little ❤, Give me a little encouragement 1, Object oriented thought 1.1 over ...