行转列：SQL SERVER PIVOT与用法解释
在数据库操作中，有些时候我们遇到需要实现行转列的需求，例如一下的表为某店铺的一周收入情况表： WEEK_INCOME(WEEK VARCHAR(10) ,INCOME DECIMAL )
在数据库操作中，有些时候我们遇到需要实现“行转列”的需求，，例如一下的表为某店铺的一周收入情况表：
WEEK_INCOME(WEEK VARCHAR(10),INCOME DECIMAL)
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
What is the analysis of 2.8k screen?
Jan 02, 2024 pm 12:21 PM
We often see the introduction of how many K screens we have when buying TVs, computers or mobile phones, such as 2.8K screens. At this time, there will be friends who don’t know much about electronic devices and will be curious about what this 2.8K screen means and what the resolution is. What does 2.8k screen mean? Answer: 2.8k screen means that the screen resolution is 2880*18002K, which means the number of horizontal pixels is greater than 2000. For the same size screen, the higher the resolution, the better the picture quality. Introduction to resolution 1. Since the points, lines and surfaces on the screen are all composed of pixels, the more pixels the monitor can display, the finer the picture, and the more information can be displayed in the same screen area. 2. The higher the resolution, the greater the number of pixels, and the sharper the sensed image.
Analyze the usage and classification of JSP comments
Feb 01, 2024 am 08:01 AM
Classification and Usage Analysis of JSP Comments JSP comments are divided into two types: single-line comments: ending with, only a single line of code can be commented. Multi-line comments: starting with /* and ending with */, you can comment multiple lines of code. Single-line comment example Multi-line comment example/**This is a multi-line comment*Can comment on multiple lines of code*/Usage of JSP comments JSP comments can be used to comment JSP code to make it easier to read
How to install, uninstall, and reset Windows server backup
Mar 06, 2024 am 10:37 AM
WindowsServerBackup is a function that comes with the WindowsServer operating system, designed to help users protect important data and system configurations, and provide complete backup and recovery solutions for small, medium and enterprise-level enterprises. Only users running Server2022 and higher can use this feature. In this article, we will explain how to install, uninstall or reset WindowsServerBackup. How to Reset Windows Server Backup If you are experiencing problems with your server backup, the backup is taking too long, or you are unable to access stored files, then you may consider resetting your Windows Server backup settings. To reset Windows
Usage of WPSdatedif function
Feb 20, 2024 pm 10:27 PM
WPS is a commonly used office software suite, and the WPS table function is widely used for data processing and calculations. In the WPS table, there is a very useful function, the DATEDIF function, which is used to calculate the time difference between two dates. The DATEDIF function is the abbreviation of the English word DateDifference. Its syntax is as follows: DATEDIF(start_date,end_date,unit) where start_date represents the starting date.
How to correctly use the exit function in C language
Feb 18, 2024 pm 03:40 PM
How to use the exit function in C language requires specific code examples. In C language, we often need to terminate the execution of the program early in the program, or exit the program under certain conditions. C language provides the exit() function to implement this function. This article will introduce the usage of exit() function and provide corresponding code examples. The exit() function is a standard library function in C language and is included in the header file. Its function is to terminate the execution of the program, and can take an integer
Introduction to Python functions: Usage and examples of abs function
Nov 03, 2023 pm 12:05 PM
Introduction to Python functions: usage and examples of the abs function 1. Introduction to the usage of the abs function In Python, the abs function is a built-in function used to calculate the absolute value of a given value. It can accept a numeric argument and return the absolute value of that number. The basic syntax of the abs function is as follows: abs(x) where x is the numerical parameter to calculate the absolute value, which can be an integer or a floating point number. 2. Examples of abs function Below we will show the usage of abs function through some specific examples: Example 1: Calculation
Introduction to Python functions: Usage and examples of isinstance function
Nov 04, 2023 pm 03:15 PM
Introduction to Python functions: Usage and examples of the isinstance function Python is a powerful programming language that provides many built-in functions to make programming more convenient and efficient. One of the very useful built-in functions is the isinstance() function. This article will introduce the usage and examples of the isinstance function and provide specific code examples. The isinstance() function is used to determine whether an object is an instance of a specified class or type. The syntax of this function is as follows
Detailed explanation and usage introduction of MySQL ISNULL function
Mar 01, 2024 pm 05:24 PM
The ISNULL() function in MySQL is a function used to determine whether a specified expression or column is NULL. It returns a Boolean value, 1 if the expression is NULL, 0 otherwise. The ISNULL() function can be used in the SELECT statement or for conditional judgment in the WHERE clause. 1. The basic syntax of the ISNULL() function: ISNULL(expression) where expression is the expression to determine whether it is NULL or
