10 recommended articles about SSE
PHP can connect to the database but cannot create database, how to solve it? Paste the code first: PHP code I wrote this code under zend, the running environment is WAMP, and the running result is successERROR, which means there is no problem connecting to the database, but there is an error when executing CREATE DATABASE hello. I don't understand what's going on, please give me some advice. ------solution-------------------- Check to see if you have permission to create a database ------Solution--------------------You change echo "ERROR"; to echo mysql_error(); and you don't need any "meaning" 1. PHP can connect to the database but cannot create database. How to solve the problem? Introduction: PHP can connect to the database but cannot create database. How to solve the problem? Paste the code first: PHP code
1. 5 recommended articles about mysql_errno()
Introduction: PHP can connect to the database but cannot create database, how to solve it? First post the code: PHP code, I wrote this code under zend, the running environment is WAMP, the running result is successERROR, which means there is no problem connecting to the database, but there is an error when executing CREATE DATABASE hello. I don't understand what's going on, please give me some advice. ------Solution--------------------See if you have permission to create a database...
2. Recommended 10 articles about the mysql_errno() function
##Introduction: PHP can connect Database but cannot create database, how to solve it? First post the code: PHP code, I wrote this code under zend, the running environment is WAMP, the running result is successERROR, which means there is no problem connecting to the database, but there is an error when executing CREATE DATABASE hello. I don't understand what's going on, please give me some advice. ------Solution--------------------Check if you have permission to create a database-----...
3. 10 recommended content for Label control
Introduction: For To describe the problem clearly, let's first look at an example. In this example, there is a button on the WinForm. When the user clicks the button, an existing Assembly will be loaded, and the FullName of the Assembly will be displayed on the Label control of the interface. Friends who are a little familiar with Reflection know that this is a very simple thing. You only need to use the Assembly.LoadFile method to obtain the Assembly, and then use the FullName attribute to display it, such as the following...
4. Summarize the points to note about loading and unloading
Introduction: In order to solve the problem To describe clearly, let’s look at an example first. In this example, there is a button on the WinForm. When the user clicks the button, an existing Assembly will be loaded, and the FullName of the Assembly will be displayed on the Label control of the interface. Friends who are a little familiar with Reflection know that this is a very simple thing. You only need to use the Assembly.LoadFile method to obtain the Assembly, and then use the FullName attribute to display it, such as the following...
5. Recommend 10 AppDomain source codes (collection)
Introduction: In order to The problem is clearly described, let's look at an example first. In this example, there is a button on the WinForm. When the user clicks the button, an existing Assembly will be loaded, and the FullName of the Assembly will be displayed on the Label control of the interface. Friends who are a little familiar with Reflection know that this is a very simple thing. You only need to use the Assembly.LoadFile method to obtain the Assembly, and then use the FullName attribute to display it, such as the following...
6. Summary of 10 basic drawing usage example tutorials
Introduction: Pseudo classes and pseudo elements are independent of the document structure. The way they obtain elements is not based on basic element characteristics such as id, class, and attributes, but on elements in a special state (pseudo-classes), or on special content in the elements (pseudo-elements). The differences are summarized as follows: CSS pseudo-classes (Pseudo-classes): used to add special effects to certain selectors, that is, add special effects (usually dynamic effects) based on the current static style of the element, so an element When it reaches a specific state, it may get a pseudo-class style; when the state changes...
7. Recommended articles about bootstrap.js
Introduction: This article mainly introduces a detailed explanation of how to introduce bootstrap.js in the advanced version of Yii2, which has certain reference value. , interested friends can refer to it. In frontend/assets/AppAsset.php code sample namespace frontend\assets;use yii\web\AssetBundle;/** * Main frontend...
8. 10 recommended articles about testing framework
##Introduction: This article gives you a brief introduction The installation and simple usage of mocha, the most commonly used testing framework in NodeJS, supports running Javascript code tests directly on the browser. The most commonly used testing framework recommended here is mocha. It supports a variety of node assert libs, supports both asynchronous and synchronous testing, supports multiple ways to export results, and also supports running Javascript code tests directly on the browser. Most of the examples in this article are from the official website examples, part...
9. Detailed introduction to parameter tuning
Introduction: nginx parameter tuning worker_processes 3; //The number of cpu cores is -1, the effect is better when used #worker_processes 4;#worker_cpu_affinity 0001 0010 0100 1000;# error_log logs/error.log;#error_log logs/error.log notice;#error_log logs/error.log...
10. 10 recommended articles about sizeof
Introduction: 1. Introduction In the previous article, we created a window from scratch. One of the most important steps is to register the window class, as shown in the following code: //Register window class BOOL Register(LPSTR lpClassName, WNDPROC wndProc){ WNDCLASSEX ...
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Full table scanning may be faster in MySQL than using indexes. Specific cases include: 1) the data volume is small; 2) when the query returns a large amount of data; 3) when the index column is not highly selective; 4) when the complex query. By analyzing query plans, optimizing indexes, avoiding over-index and regularly maintaining tables, you can make the best choices in practical applications.

Yes, MySQL can be installed on Windows 7, and although Microsoft has stopped supporting Windows 7, MySQL is still compatible with it. However, the following points should be noted during the installation process: Download the MySQL installer for Windows. Select the appropriate version of MySQL (community or enterprise). Select the appropriate installation directory and character set during the installation process. Set the root user password and keep it properly. Connect to the database for testing. Note the compatibility and security issues on Windows 7, and it is recommended to upgrade to a supported operating system.

InnoDB's full-text search capabilities are very powerful, which can significantly improve database query efficiency and ability to process large amounts of text data. 1) InnoDB implements full-text search through inverted indexing, supporting basic and advanced search queries. 2) Use MATCH and AGAINST keywords to search, support Boolean mode and phrase search. 3) Optimization methods include using word segmentation technology, periodic rebuilding of indexes and adjusting cache size to improve performance and accuracy.

The difference between clustered index and non-clustered index is: 1. Clustered index stores data rows in the index structure, which is suitable for querying by primary key and range. 2. The non-clustered index stores index key values and pointers to data rows, and is suitable for non-primary key column queries.

MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.

MySQL and MariaDB can coexist, but need to be configured with caution. The key is to allocate different port numbers and data directories to each database, and adjust parameters such as memory allocation and cache size. Connection pooling, application configuration, and version differences also need to be considered and need to be carefully tested and planned to avoid pitfalls. Running two databases simultaneously can cause performance problems in situations where resources are limited.

In MySQL database, the relationship between the user and the database is defined by permissions and tables. The user has a username and password to access the database. Permissions are granted through the GRANT command, while the table is created by the CREATE TABLE command. To establish a relationship between a user and a database, you need to create a database, create a user, and then grant permissions.

MySQL supports four index types: B-Tree, Hash, Full-text, and Spatial. 1.B-Tree index is suitable for equal value search, range query and sorting. 2. Hash index is suitable for equal value searches, but does not support range query and sorting. 3. Full-text index is used for full-text search and is suitable for processing large amounts of text data. 4. Spatial index is used for geospatial data query and is suitable for GIS applications.
