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SQL query return data from multiple tables
...mply a color listing so that we know what colors we have in the car yard.
mysql> create table colors(id int(3) not null auto_increment primary key,
-> color varchar(15), paint varchar(10));
Query OK, 0 rows affected (0.01 sec)
mysql> show columns from colors;
+-------+-------------+-...
Getting the minimum of two values in SQL
...
For MySQL or PostgreSQL 9.3+, a better way is to use the LEAST and GREATEST functions.
SELECT GREATEST(A.date0, B.date0) AS date0,
LEAST(A.date1, B.date1, B.date2) AS date1
FROM A, B
WHERE B.x = A.x
With:
GREATEST(v...
How can I SELECT rows with MAX(Column value), DISTINCT by another column in SQL?
...
The fastest MySQL solution, without inner queries and without GROUP BY:
SELECT m.* -- get the row that contains the max value
FROM topten m -- "m" from "max"
LEFT JOIN topten b -- "b" from "...
MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
...，有助于在必要时把从切换成主。
下面最重要的步骤是如何克隆一份主服务器的数据：
如果数据库使用的是MyISAM表类型的话，可按如下方式操作：
shell> mysqldump --all-databases --master-data=1 > data.sql
注：master-data选项缺省会打开l...
企业级负载平衡简介 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...务器。该设备会根据其内部所包含的请求分发逻辑来决定如何对这些请求进行分发，以避免出现单个服务器过载的情况。这些用来对请求进行分发的设备实际上就是负载平衡服务器。
当然，我们不会等到服务器真正过载了才去...
Include headers when using SELECT INTO OUTFILE?
Is it possible to include the headers somehow when using the MySQL INTO OUTFILE ?
18 Answers
...
MySQL LIKE IN()?
...eing sufficient to give me the correct results, using LIKE as well allowed MySQL to reduce the result set considerably before having to use the slower REGEXP criteria.
– mpen
Feb 15 '12 at 0:11
...
C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升
... list.Clear();//清空列表
fStream.Position = 0;//重置流位置
list = (List<Programmer>)binFormat.Deserialize(fStream);//反序列化对象
foreach (Programmer p in list)
{
Console.WriteLine(p);
}
...
C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升
... list.Clear();//清空列表
fStream.Position = 0;//重置流位置
list = (List<Programmer>)binFormat.Deserialize(fStream);//反序列化对象
foreach (Programmer p in list)
{
Console.WriteLine(p);
}
...
C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升
... list.Clear();//清空列表
fStream.Position = 0;//重置流位置
list = (List<Programmer>)binFormat.Deserialize(fStream);//反序列化对象
foreach (Programmer p in list)
{
Console.WriteLine(p);
}
...