about mysql

Previously, only in the data encountered compound primary key, just know how to build composite primary key, but never personally used, today in the use of Lavarel Rights Management plug-in, encountered:CREATE TABLE' Qpr_role_user '

Recently just contacted MySQL, in the establishment of the expression encountered some problems, always prompt error code: The Can ' t create table ..., so I went to the internet to search for a bit of the following points to note:[CONSTRAINT

A query for numeric data:SELECT * from Tb_name WHERE sum > 100;Query predicate:>,=,,!=,!>,!,=Two query stringsSELECT * from tb_stu WHERE sname = ' Xiao Liu 'SELECT * from Tb_stu WHERE sname like ' Liu 'SELECT * from Tb_stu WHERE sname like '%

Use MySQL to insert data containing Chinese in usercase table, error [ERR] 1366-incorrect String value: ' \xe5\xb0\x8f\xe5\xb0\x8f ' for column ' name ' at row 1The table statement and the inserted data statement are as followsCREATE TABLE usercase (

In the MySQL database, set the ID for the self-growth type, but because the program is still in the development phase, it is easy to produce error data, and then directly deleted, but the ID of the self-growth value is not reduced, here is the

First check that the MySQL service does not start if it does not start, then start the service.Yesterday, after restarting the server after the MySQL ' localhost ' (10061) error, began to think that because the database link open too much, the

CREATE TABLE ' uniontest ' ( ' id ' int (one) not null auto_increment, ' menuname ' varchar () DEFAULT NULL, ' url ' V Archar (+) DEFAULT NULL, PRIMARY key (' id '), UNIQUE key ' U_index ' (' menuname ', ' url ')) Engine=innodb auto_ Increment=5

The idea of ①mysql optimization1,sql statement optimization and index optimization2, Optimization of database table structure3, System Configuration4, hardware optimizationIiView slow query log status: Show variables like ' Slow_query_log 'If the

Sets the character set set NAMES UTF8;Create a database "databases";Show all databases show DATABASES;Using the database use "Dataname"Show all tables show TABLES;Modify the name of the Table RENAME table study to Study_new;ALTER TABLE study_new

Today is boring, casually say point ...The book was answered,650) this.width=650; "title=" 2015-08-26_112208.png "src=" http://s3.51cto.com/wyfs02/M00/72/2C/ Wkiol1xehh-agdggaagipu58uy4709.jpg "alt=" Wkiol1xehh-agdggaagipu58uy4709.jpg "/>Yes,

Problem Summary :MySQL Server has gone away?This problem has to be traced back to the Nantong Software Park on business. The afternoon before work, the supervisor said it might be a business trip tomorrow, the project and the latest database back

A mature database architecture is not designed with high availability, high scaling, and other features at the beginning. It is gradually improved with the increase in the number of users. This blog post focuses on the problems and optimization

After I switched to wordpress, the first consideration was its database backup and recovery problem, because bloger knows that all of its blog records are valuable materials and texts that they need, if the database crashes or the Space Provider

MySQL databases are IO-intensive programs. Like other databases, their main functions are data persistence and data management. This article focuses on optimizing MySQL database cache parameters such as query cache, table cache, log cache, index

When creating a test paging table, there is warnings. How can we still see warnings information when creating the table? partition (Region, usernamevarchar (30), primarykey (uid) engineinnodbdefacharsetutf8; QueryOK, 0 rowsaffected, When creating a

Help me, Accessdeniedforuser & #39; root & #39; @ & #39; 192.168.1.102 & #39; (usingpassword: YES) What is the problem, no solution is available for searching on the internet. please help me. thank you! I log on to my project and call the database

Selecttemplatename, t. templateid, t. templatecontent, t. lastupdateby, t. lastupdatetime, t. createtime, createbyfromT_OBS_SMSTEMPLATEtwheretenantid & quot; + this. getCurrTenantID (); I am very grateful to anyone who can explain this sentence to

Dear friends, the younger brother is a new employee and takes over the maintenance of an existing system. he wants to build a test environment and copy the mysql database in use on another machine, fail for half a day. please try again. Background:

Install and configure the mysql-ODBC driver in 64-bit win7 To use powerdesigner, you need to configure ODBC. after repeated failures, the following knowledge points are summarized: 1. there are some bugs in ODBC drivers of different versions

Because of work requirements, you need to write a mysql custom number of rows, as shown below: DELIMITER $ DROPFUNCTIONIFEXISTS 'onlinefunction '$ CREATEFUNCTION 'onlinefunction' (rrrrVARCHAR (50) RETURNSVARCHAR (255) BEGINIF (rrrronline) THENRETURN