MySQL

#在存储过程中使用游标DROP TABLE IF EXISTStbl;CREATE TABLEtbl (IDINT not NULLAuto_increment, TitleVARCHAR( -) not NULL, authorVARCHAR( -) not NULL, PRIMARY KEY(ID));DROP PROCEDURE IF EXISTSSP7;CREATE PROCEDURESP7 (INOUT rstVARCHAR( -), Out Rst_codeINT, Out

1. Refresh the data column when creating new records and modifying existing records:TIMESTAMP DEFAULT current_timestamp on UPDATE current_timestamp2. Set this field to the current time when creating a new record, but do not refresh it when you

First paradigm: Ensure the atomicity of each column.The first paradigm is the most basic paradigm.A field in a database table is a single attribute and cannot be divided.As long as the relational database satisfies the first paradigmIf each column

Back up the table data locally from the server, using the Navicat, right-click Table Dump SQL file, but always report an exception when you run the SQL file locally[ERR] 1064-you has an error in your SQL syntax; Check the manual, corresponds to your

Index optimization, B-treeSuppose a table has a federated index (C1,C2,C3,C4) The following can only use the C1,C2,C3 portion of the Federated IndexA. Where c1 = x and C2 = x and C4>x and C3 = XB. Where c1 = x and C2 = x and c4=x order by C3C. Where

The storage engine, also known as the table type, refers to the way that MySQL uses different technology settings for various scenarios to store tables.Common ones are:

MySQL information_schema introduction First, INFORMATION_SCHEMA is whatInformation_schema is a mysql-brought information database that holds information about all the other databases maintained by the MySQL server, such as database names, database

Note:1, like only when the data is listed as a string, and like is not the beginning of the index will be effective2, greater than less than the index will only be effective when the data is listed as integral type3. If you want to use or, and you

The test is conducted in three cases, namely:First case: In and or where the column is the primary key.The second case is where the in and or columns are created with an indexed case.The second case is where the in and or columns do not have an

SELECT*FromTable1SELECT*From table1WHERE ID>=1and ID20and IDIn (1,2,3,4,5,6,7,8,9)OR (IDBetween1and10)SELECT*From Table3WHERE t3date>=‘2011-08-10‘SELECT*From table1WHERE IDIsNotNullGROUPby Id,t1nameORDERById,t1nameSELECT*From (SELECT

"MySQL driver for Node"1. Installation　　2. An example　　From this example, you can learn the following: Every method you invoke on a connection are queued and executed in sequence. Closing the connection is do using end() which makes

Modify the password for the MySQL database in XAMPPXAMPP is only for developers and cannot be used in production environments. First, the MySQL administrator (root) does not set a password, and the user can access the MySQL server directly through

The idea is mainly because the win system was previously loaded with MySQL, the service name is MySQL. Re-install XAMPP, resulting in MySQL conflict, xampp in the MySQL always start not up.The workaround is as follows: 1, modify the port of MySQL in

Mysql_fetch_row fetching a row from the result set as an enumerated array$db _conn=mysql_connect (' 127.0.0.1 ', ' root ', ' 123456 ') or die (cant connect mysql);//Connect to the database, if there is an error, you cannot connect.mysql_query ("Set

GitHttps://github.com/sea-boat/mysql-protocolOverviewThis fieldlist command package corresponds to the MySQL client when using the Show Column command.MySQL Communication message structure type name Description

Database addition, deletion, modification, query (CURD), Database curd You can use CURD to add: create modify: update search: read delete: delete Add create: insert + Table name + values + (information ); Insert + Table Name (field name 1, field

Mysql Data Backup and mysql Data Backup This article uses mysql5.5 centos6.5 64-bit (I use rpm to install mysql, the default database installation directory)I. Considerations for Data Backup Read locks: Once a database (or a table) performs read

Install and configure Mysql5.7.14 This article mainly covers how to install mysql5.7.14 using the previous installation method to solve problems such as logon Failure and password failure. I hope this will help my friends who are equally

Tutorial on installing and configuring mysql5.7.17 in Linux (Ubuntu), ubuntumysql5.7.17 Preface Mysql5.6 was installed earlier. After three months, the development team reported that JSON data needs to be processed in MySQL. view the document. JSON

Mysql 5.7.16 installation and configuration method graphic tutorial (ubuntu 16.04), 5.7.1616.04 Ubuntu16.04 how to install MySQL5.7? Install the main program There are two ways to install the main program:-Fully Automated installation using apt-get #