Programming VIP

1, Optimization direction 1. Five resources + kernel at host level 2. At the service level, find the core function of the service in the architecture → core optimization 3. Code, business level → assistance / assistance direction 4. Docking (tomcat connector nginx → php → fpm module fastCGI 9000) 2, Hardware optimizati ...

1, Game Description The player controls the movement of the aircraft by moving the mouse (the aircraft is always on the left, and the monster appears on the right). Click the left mouse button to launch shells. If the shells hit the monster, the monster will explode. The player will get one point. After the player's cumulative score reaches th ...

Mysql 178. Score ranking Medium difficulty SQL schema Write an SQL query to achieve score ranking. If the two scores are the same, the two scores Rank the same. Please note that the next ranking after bisection should be the next consecutive integer value. In other words, there should be no "interval" between ranking. +----+---- ...

1, Table structure 1.1 student list create table student( sid varchar(10) NOT NULL COMMENT 'student ID', username varchar(20) NOT NULL COMMENT 'Student name', sex enum("man","woman") NOT NULL DEFAULT 'man' COMMENT 'Gender', birthday datetime NOT NULL DEFAULT '1971-01-01 00:00:00' COMMENT 'date of birth', primary key(sid) ...

Tip: the project acquisition method is at the end of the article preface Today, senior students share a graduation design project: Design and implementation of performance appraisal system for bank teller business Using tomcat server and mysql database development tool eclipse, the project contains source code, supporting graduation t ...

Basic operations of mysql (1) Create database CREATE DATABASE `school` Create table CREATE TABLE `student` ( #Table name `id` int(4) NOT NULL AUTO_INCREMENT COMMENT 'Student number', #Details of the elements of the column, column self increment `name` varchar(4) NOT NULL DEFAULT 'anonymous' COMMENT 'full name', `pwd` varchar(20) NOT ...

06 view, trigger, thing, stored procedure, function 1. View 1.1. What is a view ''' View is to get a virtual table through query, and then save it for direct use next time In fact, views are also tables ''' 1.2. Why view ''' If you want to frequently operate a virtual table (composed of spell tables), you can make it into a view for su ...

1. The tables of database can be divided into two categories: vertical table and horizontal table Vertical table: the fields and field values in the table are in the form of key value, that is, two fields are defined in the table, one of which stores the field name and the other stores the value of the field represented by the field name. For ...

#Advanced 6: link query /* Meaning: it is also called multi table query. When the query fields come from multiple tables, the join query will be used Cartesian product phenomenon: Table 1 has m rows, table 2 has n rows, and the result is mn rows Cause: there is no valid continuous condition How to avoid: adding valid connection conditions Class ...

Centos7 installation mysql8 (two installation methods) super detailed 1, Command installation 1. Configure Mysql 8.0 installation source: rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm [root@localhost home]# rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm obtain https://dev.mysql. ...