mysql lookup table tutorial

values are: InnoDB, CRC32, none, Strict_innodb, Strict_crc32, Strict_none.5.Named File formats mechanismWith the development of the InnoDB storage engine, new page data structures are sometimes used to support new feature features. such as the InnoDB 1.0.X release provides a new page data structure to support table compression functionality, full overflow (Off page) large variable long character type field storage. These new page data structures are

MYSQL Tutorial: create an encrypted connection to the MySQL server to control user access to the database through the permission table. The permission table is stored in the mysql database and initialized by the mysql_install_db s

, the command prompt prompts you to continue typing (there are individual exceptions, but the semicolon is definitely not wrong);Hint: You can use show databases; command to see which databases have been created.Select the database you want to manipulateTo operate on a database, you must first select the database, or you will be prompted with an error:ERROR 1046 (3d000): No Database selectedTwo options for using the database:One: specified when logging in to the database, command:

Atitit. mysql oracle with as mode temporary table mode CTE statement, reduce the subquery structure mssql SQL server..., atitit. mysqlcte Atitit. Use of the CTE statement in the temporary table mode of mysql oracle with as mode to reduce the structural mssql SQL server of subqueries .. 1. with... as (...) in

This article mainly introduces the Mysql simple tutorial (3). If you need more information, refer to the previous article to introduce the simple mysql tutorial (2) Merge two tables with the same structure in mysql: (note that the structure of the two tables must be the sam

database efficiency for large tables and tables with various access patterns. Some of the benefits of partitioning include: More data can be stored than a single disk or file system partition. For data that has lost its meaning, it is often possible to delete those data by deleting the partitions associated with those data. Conversely, in some cases, the process of adding new data can be easily implemented by adding a new partition specifically for those new data. Other benefits t

PARTITION p0,p1,p2,p3,p4 into (PARTITION p0 VALUES less THAN); Query OK, one rows affected (0.08 sec) records:11 duplicates:0 warnings:0 List re-partition mysql> ALTER TABLE list_part REORGANIZE PARTITION p0,p1,p2,p3,p4 to (PARTITION p0 VALUES in (1,2,3,4,5)); Query OK, 0 rows affected (0.28 sec) records:0 duplicates:0 warnings:0 Hash and key partitions can not be used reorganiz

1. test PROCEDURE.DELIMITER $Drop procedure't _ girl '. 'SP _ split_table' $Create procedure't _ girl '. 'SP _ split_table '()BEGINDeclare done int default 0;Declare v_user_name varchar (20) default '';Declare v_table_name varchar (64) default '';-- Get all users 'name.Declare cur1 cursor for select user_name from t_group group by user_name;-- Deal with error or warnings.Declare continue handler for 1329 set done = 1;-- Open cursor.Open cur1;While done DoFetch cur1 into v_user_name;If not done t

). When this is set, the table name is saved in lowercase on the hard disk, and MySQL converts all table names to lowercase storage and lookup tables. This behavior is also appropriate for database names and table aliases .That is, after

MySQL Create data tableThe following information is required to create a MySQL data table: Table name table field Name Define each table field GrammarThe following is the general SQL syntax for creating

In fact, we used only the MySQL tutorial show usage in fact one, in the MySQL simple operation as follows Show Table This will show all the tables, but in the PHP tutorial, we'll look at the following code $server = ' localhost '; $user = ' root '; $pass = '; $

MySQLDBA Tutorial: Mysql Performance Optimization-cache parameter optimization bitsCN.com Databases are IO-intensive applications. their primary responsibilities are data management and storage. We know that the time for reading a database from the memory is microseconds, while reading an IO from a common hard disk is in milliseconds. The difference between the two is three orders of magnitude. Therefore, t

Website construction tutorial (7): SQL Elementary tutorial tip: SQL is a standard computer language for accessing and processing databases. SQL is a standard computer language used to access and process databases. Use SQL to manage dataStructured Query Language (SQL) is a standard language used to Access databases, including SQL Server, Oracle, MySQL, Sybase, an

For large tables in the database, statistical queries are usually slow, and you need to consider whether the query will affect online applications, in this case, we can use an intermediate table to increase the query statistics speed. Next we will count counttable to count the daily consumption records of customers, as shown below. This tutorial will tell you aboutHow to improve the statistical query speed

Yundun practices Mysql series tutorial (2) the best database operations in history that you don't know, mysqlI. Database Operations 1. view the database Show databases; # default database: mysql-user permission-related data test-used for user test data information_schema-MySQL architecture-related data2. Create a datab

A basic tutorial on querying logs and slow query logs in MySQL, I. query logs Query all the queries in MySQL by using "-- log [= file_name. Because all the queries, including all the select statements, are recorded, and the size is relatively large, it also has a great impact on the performance after enabling them. Therefore, please use this function with caution

History of the simplest MySQL Data Backup and restoration tutorial (medium) (), mysql Data Backup Data backup and Restoration: Basic concepts: BackupSave the existing data or records in another copy; RestoreTo restore the data to the backup status. Why do we need to back up and restore Data? Prevents data loss and protects data records. There are many data backup

MySQL Proxy installation and basic command usage tutorial, mysqlproxy One of the most powerful features of MySQL Proxy is the end of "Read/Write Splitting )". The principle is to allow the primary database to process transactional queries, but to process SELECT queries from the database. Database Replication is used to synchronize changes caused by transactional

MySQL5.5 semi-synchronous replication I. tutorial purpose: Mysql also supports semi-synchronous replication in master-slave replication. mysql replication is asynchronous because of poor synchronization performance. After the master database distributes events, you must wait until the slave database completes copying data and receives the normal response from th

The syntax of MySQL The great thing that you do in MySQL is that "code" is very easy to read for humans, and not more difficult programming languages such as C or C + +. Only a handful of special characters and symbols must be set up for a MySQL query, the query includes the most complete English words! Learning Strategy MySQL's The