10 recommended content for affected
This article collects 10 articles about the mysql_affected_rows() function and recommends it to everyone 1. PHP interview question 5 - MySQL database (basic part) mysql database download 64-bit sql database instance download sql database patch download introduction : Mysql database: PHP interview question No. 5 - MySQL database (basic part): mysql_num_rows() mysql_affected_rows() Both functions act on the results of the mysql_query($query) operation, and mysql_num_rows() returns the number of rows in the result set. mysql_affected_rows() gets the number of record rows affected by the previous MySQL operation. mysql_num_rows() is only valid for SELECT statements, to get the number of changed rows after INSERT, UPDATE or DE2. PHP updates mysql to get the number of changed rows_PHP tutorial introduction: PHP updates mysql to get the number of changed rows. A php update
1. A summary of articles about the mysql_num_rows() function
##Introduction: This article collects 10 articles about the mysql_affected_rows() function, recommended to everyone 1. PHP interview question 5 - MySQL database (basic part) mysql database download 64-bit sql database instance download sql Introduction to database patch download: Mysql database: PHP interview question No. 5 - MySQL database (basic part): mysql_num_rows() mysql_affected_rows() Both functions act on mysql_qu...
2. Mysql_affected_rows function definition and usage summary
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Articles about the mysql_affected_rows() function Recommended 10 articles
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Detailed introduction to the mysqli_affected_rows() function
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Analysis of the row count return value of the PHP function mysqli_affected_rows
## Introduction: This article mainly introduces the row number return value of mysqli_affected_rows function in PHP. It analyzes the usage of normal mode and oop mode with examples. It has certain reference value. Friends in need can refer to it
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MySQL-mysql error 1449 solutionIntroduction: Permissions Problem, grant all sql privileges to rootmysql> grant all privileges on *.* to root@% identified by .;Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)
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3 ways to clear binlog in MySQL!Introduction: 1 mysql command purge mysql> purge master logs to "mysql-bin.000410"; Query OK, 0 rows affected (3.71 sec ) 8. How to deal with 0 affected rows after the mysql-MySQL stored procedure submits the transaction? Introduction: My stored procedure is written as follows START TRANSACTION; # Execute the insert data operation COMMIT; The result is 0 row(s) affected. The actual data has been inserted. I expect it to be able to Get the actual number of affected rows 9. mysql_affected_rows and mysql_num_rows Introduction:: This article mainly introduces mysql_affected_rows and mysql_num_rows, students who are interested in PHP tutorials can refer to them. Introduction: Mysql database: PHP interview question No. 5 - MySQL database (basic part): mysql_num_rows() mysql_affected_rows() Both functions act on the result of the mysql_query($query) operation, mysql_num_rows () Returns the number of rows in the result set. mysql_affected_rows() gets the number of record rows affected by the previous MySQL operation. mysql_num_rows() is only valid for SELECT statements. To obtain the INSERT, UPDATE or DE After UPDATE, use mysql_affected_rows to determine whether it is successful. If not, INSERT will result. Something goes wrong. mysql - The exec method of database pdo in php returns the problem of affecting the number of rows php - The sql statement is successful, but the number of rows changed is 0? ? ? About the error reporting problem of mysql grant permission statement
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The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is suitable for small and large enterprises. 1) Small businesses can use MySQL for basic data management, such as storing customer information. 2) Large enterprises can use MySQL to process massive data and complex business logic to optimize query performance and transaction processing.

MySQL index cardinality has a significant impact on query performance: 1. High cardinality index can more effectively narrow the data range and improve query efficiency; 2. Low cardinality index may lead to full table scanning and reduce query performance; 3. In joint index, high cardinality sequences should be placed in front to optimize query.
