mysql database table

PHP Tutorial Bulk Delete a table with the same prefix in the MySQL database tutorial if (@$_get["action"]== "Kill") { if (Empty ($_post[' IP ')))echo "You did not fill in the IP address";echo "";if (Empty ($_post[' user '))echo "You did

1. Partition column index constraintsIf the table has a primary key or unique key, the partition column of the partition table must be included in the primary key or unique key list to ensure the efficiency of the primary key, otherwise, the same

In Linux, the database name, table name, column name, And alias are case-sensitive: 1. The database name and table name are case sensitive; 2. Table aliases are case sensitive; 3. The column name and column alias are case-insensitive in

Previously, due to the customer's requirement to install system applications in centos, they had the opportunity to get in touch with centos. By the way, they also learned about General centos operations and MySQL-related operations in

In Linux, the database name, table name, column name, And alias are case-sensitive: 1. The database name and table name are case sensitive; 2. Table aliases are case sensitive; 3. The column name and column alias are case-insensitive in all cases;

Create a database tableIt is too common to create a database table. If you use a database, you can use the create statement to create a database table. See the following syntax:Create table tbl_name (create_definition,...) [type =

First, let's talk about why you want to divide the table. When a single piece of data reaches millions of, you'll have more time to query, and if there's a joint query, I think I might have died there. The purpose of the table is to reduce the

What is a table partition A table partition is a large table, divided into several small tables according to the conditions. Mysql5.1 began to support datasheet partitioning.For example, if a user table has more than 6 million records, the table

Copy Code code as follows: #!/bin/sh #code by Scpman #功能: Review and repair MySQL database tables #将此脚本加到定时中, when the script executes, it reads the library, lists all the tables to be repaired, and then timings to start the repair

One: MySQL myisam table damage Reason summary: 1, the server suddenly power off causing data file corruption, forced shutdown, did not first shut down the MySQL service; the mysqld process was killed while writing the table.2, disk damage.3, the

We know that WordPress database table, you can set the prefix, the default is WP_, many students also default on the Wp_, if some reason (such as increased security) to modify the prefix of the WordPress data, what should we do? 　Before you start

table field Management1. Add to endALTER TABLE name add field name data type;2 Add to startALTER TABLE name add data type first;3. Add to the specified locationALTER TABLE name add new field name data type after original field name;4. Delete a

Use INFORMATION_SCHEMA;--Querying a database storage sizeSelect Concat (Round (sum (data_length/1024/1024), 2), ' MB ') as data from tables where table_schema= ' database Nane '; 85MB--Query a table storage sizeSelect Concat (Round (sum (data_length/

MySQL Database bad table repairRadish cabbage, each their own, can work, can repair the table is the King!!!remember before repairing: back up the database first (after the backup is complete, the following repair operation)You can mysqldump-a > all.

There are 3 ways to fix MySQL database:1. mysql Native SQL command: RepairExecute the Repair TABLE SQL statementSyntax: REPAIR TABLE tablename[,tablename1 ...] [Options]Example: mysql> use database xxx;mysql> Repair Table *;2. Using MySQL's own

@ pour a table from the old database into a SQL file $mysql-uroot-p my_db > My_db.sql (enter password)@ Import $sudo apt-get install mysql-server-y (the password to initialize the root user) in the new environment $mysql-uroot-p

In the "Create Database and database table with MySQL" article, how do we create a database and database table, and how to add records to the data database table. How can we retrieve data from database tables? 1. Retrieve Information from a

Today, I am depressed. I used to downgrade a program in LINUX and said I couldn't find the table, but I obviously created the table. I can also find it under the MYSQL command line, why can't the program find the table? Later, I asked a teacher to

MySQL supports many different data types, and selecting the correct data type is crucial for high performance. No matter what type you choose, the following simple principles will help you make better choices. 1. Select the Optimized Data

In the "Create Database and database table with MySQL" article, how do we create a database and database table and how to add records to the database table. How can we retrieve data from database tables? 1. retrieving information from the database