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

我知道它并不是完全隐藏的，但是没有太多人知道PIVOT命令。我能够改变一个使用游标的存储过程，并花费2分钟来运行一段6秒的代码，而这段代码的行数是原来的十分之一!

2008-10-08 23:36:51

其他回答

下面是我写的一个查询，按最后修改日期列出所有DB用户对象:

select name, modify_date, 
case when type_desc = 'USER_TABLE' then 'Table'
when type_desc = 'SQL_STORED_PROCEDURE' then 'Stored Procedure'
when type_desc in ('SQL_INLINE_TABLE_VALUED_FUNCTION', 'SQL_SCALAR_FUNCTION', 'SQL_TABLE_VALUED_FUNCTION') then 'Function'
end as type_desc
from sys.objects
where type in ('U', 'P', 'FN', 'IF', 'TF')
and is_ms_shipped = 0
order by 2 desc

2008-09-23 15:36:33

dm_db_index_usage_stats

这允许您知道表中的数据最近是否更新过，即使表上没有DateUpdated列。

SELECT OBJECT_NAME(OBJECT_ID) AS DatabaseName, last_user_update,*
FROM sys.dm_db_index_usage_stats
WHERE database_id = DB_ID( 'MyDatabase')
AND OBJECT_ID=OBJECT_ID('MyTable')

代码来自:http://blog.sqlauthority.com/2009/05/09/sql-server-find-last-date-time-updated-for-any-table/

参考资料: SQL Server -表的最后插入行的日期/时间是什么?

在SQL 2005及更高版本中可用

2010-08-30 15:40:59

/*找到空闲空间最大的固定驱动器，也可以复制文件来估计哪个磁盘最快*/

EXEC master..xp_fixeddrives

/*在使用或引用之前检查文件的假设*/

EXEC master..xp_fileexist 'C:\file_you_want_to_check'

详情请点击这里

2008-09-23 15:09:22

查找日期落在当前周内的记录。

where dateadd( week, datediff( week, 0, TransDate ), 0 ) =
dateadd( week, datediff( week, 0, getdate() ), 0 )

查找上周发生的日期记录。

where dateadd( week, datediff( week, 0, TransDate ), 0 ) =
dateadd( week, datediff( week, 0, getdate() ) - 1, 0 )

返回当前周的开始日期。

select dateadd( week, datediff( week, 0, getdate() ), 0 )

返回上周开始的日期。

select dateadd( week, datediff( week, 0, getdate() ) - 1, 0 )

2008-09-23 15:55:41

仅限返回日期

Select Cast(Floor(Cast(Getdate() As Float))As Datetime)

Select DateAdd(Day, 0, DateDiff(Day, 0, Getdate()))

2008-09-23 15:54:23

SQL Server的隐藏特性

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