Top 10 Features of SQL 2008 R2
Introduction
Microsoft SQL Server 2008 R2 is the latest release of SQL Server. This article will introduce the top 10 features and benefits of SQL Server 2008 R2. The “R2” tag indicates this is an intermediate release of SQL Server and not a major revision. However, there are a number of interesting new features for both DBAs and developers alike. At the time of this article, R2 is available as a CTP (Community Technology Preview). In addition to new features, there are two new editions as well, SQL Server 2008 R2 Datacenter and SQL Server 2008 R2 Parallel Data Warehouse.
Report Builder 3.0
Report Builder is a tool set for developing rich reports that can be delivered over the web. Some of the features of Report Builder include the ability to create reports containing graphs, charts, tables, and printing controls. In addition, Report Builder also supports drill downs and sorting. If you are familiar with the third party tool Crystal Reports, then you have good idea of what to expect from Report Builder.
New features in SQL 2008 R2 / Report Builder 3.0 include: Map Layers, which can hold spatial and analytical data and will integrate with Microsoft Virtual Earth. Indicators, these are gauges used to show the state of one value. Report Parts, this object can be reused or shared between multiple reports. Aggregate Calculating, this allows you to calculate the total value of other aggregate calculated totals.
SQL Server 2008 R2 Datacenter
The new Datacenter edition of SQL Server 2008 R2 is targeted towards Enterprise Edition users who require a greater performance platform. The new edition will support 256 logical processors, high numbers of instances, and as much memory as the operating system will support.
SQL Server 2008 R2 Parallel Data Warehouse
Another new SQL Server edition, Parallel Data Warehouse, formally codenamed “Madison”, specializes in handling extremely large amounts of data. This new version uses massively parallel pro
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日志序列编号(LSN)是事务日志里面每条记录的编号。
当你执行一次备份时，一些LSN值就被同时存储在文件本身及msdb..backupset表中。你可以使用RESTORE HEADERONLY语法来从备份文件中获取LSN值。
注意：在SQL Server 2000中，有一列叫做DifferentialBaseLSN。但在SQL Server 2005中，相同的列名称变成了Data ......
（1）整合简单,无关联的数据库访问：
如果你有几个简单的数据库查询语句,你可以把它们整合到一个查询中(即使它们之间没有关系)
（2）删除重复记录：
最高效的删除重复记录方法 ( 因为使用了ROWID)例子：
DELETE from EMP E WHERE E.ROWID > (SELECT MIN(X.ROWID)
from EMP X WHERE X.EMP_NO = E.EM ......
新建表：
create table [表名]
(
[自动编号字段] int IDENTITY (1,1) PRIMARY KEY ,
[字段1] nVarChar(50) default '默认值' null ,
[字段2] ntext null ,
[字段3] datetime,
[字段4] money null ,
[字段5] int default 0,
[字段6] Decimal (12,4) default 0,
[字段7] image null ,
)
删除表：
Drop table [表 ......
1)
假定有一个用户表，表中包含字段：
userid
(int)
、
username
(varchar)
、
password(varchar)
、等，
该表需要设置主键，以下说法正确的是（）。（选择两项）
a)
如果不能有同时重复的
username
和
password
，那么
username
和
password
可以组合在一起作为主键。
......
sql语句查询
表结构是这样：
ID 姓名 性别
1 张三 男
2 王四 男
3 丽丽 女
4 张三 男
5 赵柳 男
6 高洁 男
7 ......
