SQL Server的隐藏特性

SQL Server有哪些隐藏特性?

例如，没有文档的系统存储过程，做一些非常有用但没有足够文档的事情的技巧?

答案

感谢大家的精彩回答!

存储过程

sp_msforeachtable: Runs a command with '?' replaced with each table name (v6.5 and up) sp_msforeachdb: Runs a command with '?' replaced with each database name (v7 and up) sp_who2: just like sp_who, but with a lot more info for troubleshooting blocks (v7 and up) sp_helptext: If you want the code of a stored procedure, view & UDF sp_tables: return a list of all tables and views of database in scope. sp_stored_procedures: return a list of all stored procedures xp_sscanf: Reads data from the string into the argument locations specified by each format argument. xp_fixeddrives:: Find the fixed drive with largest free space sp_help: If you want to know the table structure, indexes and constraints of a table. Also views and UDFs. Shortcut is Alt+F1

片段

Returning rows in random order All database User Objects by Last Modified Date Return Date Only Find records which date falls somewhere inside the current week. Find records which date occurred last week. Returns the date for the beginning of the current week. Returns the date for the beginning of last week. See the text of a procedure that has been deployed to a server Drop all connections to the database Table Checksum Row Checksum Drop all the procedures in a database Re-map the login Ids correctly after restore Call Stored Procedures from an INSERT statement Find Procedures By Keyword Drop all the procedures in a database Query the transaction log for a database programmatically.

功能

哈希字节（） EncryptByKey 枢轴命令

Misc

Connection String extras TableDiff.exe Triggers for Logon Events (New in Service Pack 2) Boosting performance with persisted-computed-columns (pcc). DEFAULT_SCHEMA setting in sys.database_principles Forced Parameterization Vardecimal Storage Format Figuring out the most popular queries in seconds Scalable Shared Databases Table/Stored Procedure Filter feature in SQL Management Studio Trace flags Number after a GO repeats the batch Security using schemas Encryption using built in encryption functions, views and base tables with triggers

当前回答

如果你想要存储过程的代码，你可以:

sp_helptext 'ProcedureName'

(不确定是否是隐藏功能，但我一直在使用它)

2008-09-23 16:56:14

其他回答

EXCEPT和INTERSECT

在比较两个查询结果时，这两个关键字是一种更优雅的简写和可读的表达查询意图的方式，而不是编写复杂的连接和子查询。作为SQL Server 2005的新版本，它们有力地补充了在TSQL语言中已经存在多年的UNION。

EXCEPT、INTERSECT和UNION是集合论中的基本概念，集合论是所有现代RDBMS使用的关系建模的基础和基础。现在，使用TSQL可以更直观、更容易地生成维恩图类型的结果。

2008-11-25 19:36:01

用于解析存储过程参数:xp_sscanf

将数据从字符串读入每个格式参数指定的参数位置。下面的示例使用xp_sscanf 从源中提取两个值属性中的位置源字符串的格式。

DECLARE @filename varchar (20), @message varchar (20)
EXEC xp_sscanf 'sync -b -fproducts10.tmp -rrandom', 'sync -b -f%s -r%s', 
  @filename OUTPUT, @message OUTPUT
SELECT @filename, @message

这是结果集。

-------------------- -------------------- 
products10.tmp        random

2008-09-23 14:47:43

@Gatekiller -一个更简单的方法来获得日期肯定是

CAST(CONVERT(varchar,getdate(),103) as datetime)

如果在本地不使用DD/MM/YYYY，则需要使用与103不同的值。SQL Books Online中的查找转换函数用于区域代码。

2008-09-26 17:18:55

删除到数据库的所有连接:

Use Master
Go

Declare @dbname sysname

Set @dbname = 'name of database you want to drop connections from'

Declare @spid int
Select @spid = min(spid) from master.dbo.sysprocesses
where dbid = db_id(@dbname)
While @spid Is Not Null
Begin
        Execute ('Kill ' + @spid)
        Select @spid = min(spid) from master.dbo.sysprocesses
        where dbid = db_id(@dbname) and spid > @spid
End

2008-09-23 15:56:16

我最喜欢master..xp_cmdshell。它允许您从服务器上的命令提示符运行命令并查看输出。如果你不能登录到服务器，但你需要获取信息或以某种方式控制它，它是非常有用的。

例如，列出运行SQL server的服务器C:驱动器上的文件夹。

主. .Xp_cmdshell ` dir c:\ `

您还可以启动和停止服务。

主. .xp_cmdshell的sc查询“My . 服务”的主. .xp_cmdshell 'sc stop“My . 服务”的主. .xp_cmdshell 'sc start“My . 服务”的

它很强大，但也有安全隐患。许多人禁用它，因为它很容易被用来在服务器上做坏事。但是，如果你能接触到它，它会非常有用。

2008-09-26 14:31:04

SQL Server的隐藏特性

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