MySQL

I believe a lot of friends are like me, using XAMPP integrated MySQL, because it is very convenient to operate. But it is not supported by default UTF-8, we need to manually modify the configuration file My.iniOpen the XAMPP Control Panel and open

Now write the program because of the issue of copyright, with less SQL Server. Our company began to use MySQL very vigorously. (because it is free, and there is no piracy).We all know that EF is a good ORM framework for Microsoft, and EF-linked SQL

Download the ". Net&mono" version of MySQL connector on the MySQL website https://dev.mysql.com/downloads/connector/net. Add references to all DLLs in the V4 folder in the C # Reference. V4 corresponds to ". NET FRAME4", select the corresponding

System: Ubuntu 14.04 LTSInstallation:Apt-get Install mysql//Installation database Apt-get install mysql-workbench//installation graphical interfaceUse:On startup: mysql-h [Address]-P [port]-u[username]-p[password]This will be the case when you enter:

Because the corresponding fields in the database use underscores, such as the spec_name used in entity Specname,The data can be extracted after the entity has been changed to Spec_name. The upper field in the database corresponds to the upper in the

DELIMITER $drop procedure if exists insert_f_arenarank$create procedure ' Insert_f_arenarank ' (in uid varchar (100)) Begindeclare _prep int;declare _id int;declare t_error INTEGER DEFAULT 0; DECLARE EXIT HANDLER for SQLEXCEPTION SET

Replace (STR,FROM_STR,TO_STR)--Replaces the substring in str with string To_str from_str and returns--mysql> Select Replace (' www.mysql.com ', ' w ', ' WW ');---> ' wwwwww.mysql.com '--substr (addtime, 1, Ten)--substr (string string,num start,num

Transferred from: http://www.cnblogs.com/gameman/p/3773240.htmlIn order to learn the ORM, chose the EntityFramework, experienced three days and two nights of suffering, n times wrong, in the group of the help of master, finally succeeded, now will

1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (m) 2 byte range ( -32768~32767) Mediumint (M) 3 byte range ( -8388608~83

Several design paradigms for relational databases are introduced:First paradigm: Ensure the atomicity of each column (emphasizing the atomicity of the column, that is, the column cannot be divided into several other columns). If each column (or

--select num from table GROUP by Num--select Num from table GROUP by num,nid--Special: Group by must be in where, after order by--select Num,nid F Rom table where nid > Group by Num,nid Order by Nid desc--Group BY is key-can be connected to

2017-05-26--SUBSTR (Addtime, 1, ten)--substr (string string,num start,num length);--string literal--Start is the start position--length is longSELECTD.uid, SUBSTR (U.addtime,1,Ten) asregistration time, D.cid asCID fromUser_extra_device D,UseruwhereD.

Installing MySQL on Linux is a difficult thing, yum installation is generally installed mysql5.1, now after their tireless efforts to finally be able to install mysql5.5 with Yum. The following two methods to introduce the CentOS 6.5 under the Yum

Tagged with: Action action track names free data tran span stargo to Mysql and insert 10,000 simple data. It's very slow, it's going to take about 5 minutes,But open the business. We're done in less than a second.Code:#include #include #include

Asynchronously exporting data to MySQLLast time I said I wrote the database synchronously from item because the network download speed is not the same as the database's I/O speedSo it is possible that the download is fast, but writing to the

Original link http://www.jb51.net/article/39221.htm1. To optimize the query, avoid full-table scanning as far as possible, and first consider establishing an index on the columns involved in the Where and order by.2. Try to avoid using the! = or <>

Mysql Study Notes 005 and mysql Study NotesDate Calculation MySQL provides several functions for date calculation. Balara .... For example, I want to determine the size of the pets, and calculate the difference between the current date and the date

[Switch] Mysql groups the data and extracts the latest data. For example, I have also found related solutions on the Internet. Many of the answers are such an SQL statement:Select Id, AccountId, Mark, max (CreateTime) as Latest from AccountMark as B

MySQL commonly used statements for table creation, adding fields, modifying fields, and adding indexes. This article describes the common SQL statements used by MySQL to create tables, add fields, modify fields, and add indexes. We will share this

Mysql specifies the sorting Implementation Method for a row or column, and mysql specifies the sorting Method: Desc: Cannot achieve: Method 1: Select sp. productid, sp. productname, ss. sku from sp_product sp inner join sku_skus ss on sp.