MySQL

This article describes how to optimize MySQL database queries in three ways. We all know that during the actual MySQL query optimization process, database applications, such as MySQL (the best combination with PHP), mean the operation and use of the

This article mainly describes the example of using if in MySQL statements and the specific operation steps, this document demonstrates how to use the if statement in MySQL. The following describes the specific solution. I hope it will be helpful in

MySQL triggers use the create trigger statement. The following describes the statement syntax for creating a MySQL TRIGGER in detail. It is helpful for you to learn about MySQL triggers. Create trigger create MySQL TRIGGER) syntaxCreate trigger

How can I check if the MySQL data file is corrupted? This may be a problem that many people have encountered. It doesn't matter. The following describes how to check the corrupted MySQL Data File. Due to temporary power failure, kill-9 can be used

MySQL Show statements are commonly used. The following describes the usage of MySQL Show statements. If you are interested in MySQL Show statements, take a look. show databases;     show tables from db_name;    

What is the difference between mysql and SQL server? Many new database users may not have a special understanding of the differences between the two databases. The following describes the differences between mysql and SQL server for your reference. 1

Mysql table alias can be used to solve the nested query problem. The following describes how to use Mysql table alias. If you are interested in this aspect, take a look. MySQL has been used for a long time and has been plagued by the absence of

MySQL built-in functions are very important functions. We can use MySQL built-in functions to convert strings to dates. The following describes this method for your reference. Use str_to_date) in mysql to convert a string to a date. MySQL built-in

MySQL databaseIt is an open source database based on structured data. Most people think that MySQL is the best choice for managing content without transaction processing. SQL statements are the core language of MySQL databases. However, when

Recently, a project encountered the problem of storing binary data stream files in the database, and found that common mysql apis were not used. After further research, we knew that there was a set of special APIs to do this data, it is quite

For project reasons, I tried to migrate the mysql database content to oracle tonight. Although the results failed, I learned a lot and it won't be necessary next time. Haha Because the previous project used the mysql database, and now the new

MySQL database is an open source database based on structured data. SQL statements are the core language of MySQL databases. However, when executing SQL statements in the MySQL database, you need to be careful with two traps. Trap 1: NULL values are

1005: An error occurred while creating the table.1006: database creation failed1007: the database already exists. An error occurred while creating the database.1008: the database does not exist. An error occurred while deleting the database.1009:

MySQL slow log query is unfamiliar to many new users who are new to MySQL data. The following describes the usage and benefits of MySQL slow log query for your reference. Mysql has a function to log down and run slow SQL statements. By default, this

MySQL learning footprint record 04 -- Data Filtering -- WHERE 1. Use the WHERE clause eg: mysql> SELECT prod_name,prod_price FROM products WHERE prod_price=2.50;+---------------+------------+| prod_name | prod_price |+---------------+----------

What is database/table sharding technology I. Overview table sharding is a popular concept. Especially under heavy load, table sharding is a good way to distribute database pressure. First, you need to understand why Table sharding is required. What

MySQL foreign key constraint cascading deletion when updating a database, the first table is used to store some simple blog data, and the second table is used to store comments related to these blogs. This example cleverly defines a foreign key

The most significant advantage of Mysql Cluster overview and deployment is high availability, high real-time performance, high redundancy, and high scalability. It allows you to deploy the Cluster of the "in memory" database in a non-shared system.

Database (mysql oracle) Learning summary group: data files, control files, log files oracle instances, its relationship with the database oracle instances: the instance is the memory allocated and created background process after the database is

When using the Parameter-based code to reference MySQL, the following message is always displayed: "Column 'column name' cannot be null" to solve the problem of using the Parameter-based code in MySQL: solution 1: add an oldsyntax = true to the