MySQL

The following error occurred while executing a simple DESC statement: mysql> desc ZAGCNY;Error 1030 (HY000): Got error from storage engine The literal meaning is: get error%d from the storage engine By searching, the approximate reason for this

The simple requirement is to read a piece of data from a table, and then modify the data to insert the same one. Table (assuming two table structures) INSERT into new tableSELECT * from old tableCopy data from old table to new table (assuming two

We all know that pagination will definitely use both types of sql:(1) Select COUNT (*) from table where condition(2) SELECT * FROM table where condition (page number-1) * per page When the volume of data is a large (hundreds of W), no matter what

1.like and in bulk delete specified records Like grammar Like is mainly used to blur the query sql = "Delete from A where field like '%abc% '" This can be used for characters and numbers In syntax sql = "Delete from A where field ID (1,2,3)"

One, dependent package installation The code is as follows Copy Code Yum-y install gcc gcc-c++ autoconf automake zlib* fiex* libxml* ncurses-devel libmcrypt* libtool-ltdl-devel* cmake cmake- GUI Libaio-devel bison-devel

Analysis 1: Did you set the permissions for each directory after you installed MySQL?Like what:Chown-r Root.Chown-r MySQL DataChgrp-r MySQL. Analysis 2: Finally looked at the next disk usage, if the hard disk space is not enough, we need to

An If expression IF (EXPR1,EXPR2,EXPR3) If Expr1 is true (expr1 <> 0 and Expr1 <> NULL), then the return value of if () is expr2; Otherwise, the return value is EXPR3. The return value of IF () is a numeric value or a string value, depending on

INSERT INTO SELECT syntax Statement form: Insert into Table2 (field1,field2,...) Select Value1,value2,... from Table1 Example The code is as follows Copy Code Insert into User1 (name,address,phone) select

Perform a scheduled backup script when adding crontab tasks from the library server The code is as follows Copy Code #crontab-E Add the following: The code is as follows Copy Code 1

Master configuration: The code is as follows Copy Code Log-bin = Mysql-binServer-id = 1Binlog-do-db = Powerdns #要同步的数据库 Master new Slave Account: The code is as follows Copy Code

Sometimes large inserts and updates are limited by max_allowed_packet parameters, resulting in failure. This value is set to cause a single record to exceed the limit and write to the database fails, and subsequent record writes will fail. The

The length function inside MySQL is a built-in function to get the length of the string. Examples of specific uses are as follows: (1) To see the length of a string (such as the site) SELECT LENGTH (' www.111cn.net '); (2) Query article table

In MySQL, the default text field is sorted by the first character of the text field, that is, if a table structure is as follows: If you sort the field by default for this text type, such as SELECT * FROM table ORDER by F1 ASC. The results

Example One The code is as follows Copy Code Grant all privileges on wxtest.* to root175@111.34.73.175 identified by ' 11111 ' Add a root175 user, password is 11111, can only login on the 111.34.73.175, and the

1. Calculation of years You want to figure out how old this person is by birthdays. The code is as follows Copy Code SELECT Date_format (From_days to_days (now ())-To_days (@dateofbirth)), '%Y ') + 0; 2. The

Unknown command ' "' So the ' replace all ' result or not, the import is not. However, it is possible to copy the database files directly to the past. Copy the past after the dump came out. The result is still the same effect Unknown command ' "'

First step Delete the My.ini under C:windowns Second Step Open C:mysqlbinwinmysqladmin.exe Enter user name and password The third step in DOS input mysqld-nt-remove Delete Service Then enter the Mysqld-nt-install Step Fourth enter MySQL to

[Root@aslibra www.aslibra.com]# mysql-s/data/www.aslibra.com/mysql/mysql.sock-uadmin-ppasswordWelcome to the MySQL Monitor. Commands End With; or G.Your MySQL Connection ID is 322891Server Version:5.5.2-m2-log Source Distribution Type ' help, ' or '

MySQL Tutorial too many connections Solution: 1. Join try/catch/finally where you use MySQL data source 2. Check whether the mysqlconnection after use to do close () 3. Do not make the mysqlconnection connection static, each connection creates a

Common MySQL Tutorial database tutorial connection stringMyodbcMYODBC 2.50 Local Database Driver={mysql}; Server=localhost;option=16834;database=mydatabase; MYODBC 2.50 Remote Databases Driver={mysql}; server=myserveraddress; port=3306;option=1310