Programmer Think

Nginx download address: http://nginx.org/en/download.html MySQL download address: https://dev.mysql.com/downloads/mysql/ PHP download address: https://windows.php.net/download/ Step 1: download the required installation package Create a new folder containing the above three compressed packages, and create three directories to extract them ...

11.1 introduction to experimental environment The cluster environment is running normallyHive and Impala services are installed in the clusterOperating system: redhat6 fiveCDH and CM versions are 5.11.1EC2 user with sudo permission is used for operation 11.2 UDF function development - using Intellij tools Use Intellij tool to develop Hive's ...

preface Querying the same data, after using Order by and limit, may have a hundred times impact on the query results and time-consuming. Optimizing SQL is not only to optimize those slow queries with more than 1 second, but also those with ultra-high frequency of 0.1 second. Here, I simulated and created a table limit_table And initialize the ...

School information system maintenance (2) Start preparation: 1. Open the Layui framework offline manual or online manual. 2. Open the bootstrap offline manual. 3. Open the SQL Sever database 1, Construction of school information data form 1.1 document introduction Open the view in the [SchoolInformation] area controller created in th ...

Welcome to WeChat official account: Xiamen micro think network. Wechat (official website): https://www.xmws.cn/ During holidays, people who return home and go out to play in the first and second tier cities are almost faced with a problem: grab train tickets! Although tickets can be booked in most cases, I believe everyone has a deep unders ...

IoTDB It is the first open source time series database project initiated by Tsinghua University and is now the top project of Apache. IoTDB can provide users with services such as data collection, storage and analysis. Due to its lightweight architecture, high performance and high availability, and seamless integration with Hadoop and Spark eco ...

🎈 Write in front 🙋‍♂️ Hello everyone, I'm super dream. We all know that we have to deal with the database almost every day, whether in study or daily work. In order to better operate the database, our SQL knowledge reserve is essential. If you want to master SQL well, you must practice and study every day. Next, Xiaomeng will lead our p ...

1, Why use distributed ID S? Before talking about the specific implementation of distributed ID, let's briefly analyze why we use distributed ID? What characteristics should distributed IDS meet? 1. What is distributed ID? Take MySQL database as an example: When our business data volume is small, single database and single table can fully s ...

1, Intranet penetration using proxy prepare Tutorial reference address: https://snail007.github.io/goproxy/manual/zh/#/ git address of proxy software: https://github.com/snail007/goproxy/releases Prepare two servers: One with fixed IP External network server, for example: 180.76.123.37 A server in Intranet environment, for example: 192 ...

Subquery (Continued) Comparison operator (Continued) Demonstration: how to use comparison operators in multivalued subqueries Example A: query all orders with product category No. 1 and return all field data of the order Subquery select * from sales.orders where orderid in ( select orderid from sales.orderdetails ...