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

使用GETDATE() +或-来计算附近的日期

SELECT GETDATE() - 1 -- yesterday, 1 day ago, 24 hours ago
SELECT GETDATE() - .5 -- 12 hours ago
SELECT GETDATE() - .25 -- 6 hours ago
SELECT GETDATE() - (1 / 24.0) -- 1 hour ago (implicit decimal result after division)

2011-07-14 21:21:39

其他回答

连接字符串额外功能:

MultipleActiveResultSets = true;

这就产生了ADO。Net 2.0及以上版本在单个数据库连接上读取多个只向前、只读的结果集，如果要进行大量读取，这可以提高性能。即使是混合执行查询类型，也可以打开它。

应用程序名称= MyProgramName

现在，当您希望通过查询sysprocesses表来查看活动连接列表时，程序的名称将出现在program_name列中，而不是“”。Net SqlClient数据提供程序

2008-09-23 15:21:30

在SQL Server 2005中，您不再需要运行sp-blocker-pss80存储过程。相反，你可以这样做:

exec sp_configure 'show advanced options', 1;
reconfigure;
go
exec sp_configure 'blocked process threshold', 30;
reconfigure;

然后，您可以启动SQL跟踪，并在“错误和警告”组中选择“阻塞”流程报告事件类。详情请点击这里。

2008-11-25 19:57:47

TableDiff.exe

表差异工具允许您发现和协调源表和目标表或视图之间的差异。Tablediff实用程序可以报告模式和数据的差异。tablediff最受欢迎的特性是它可以生成一个脚本，您可以在目标上运行该脚本，以协调表之间的差异。

Link

2008-09-23 16:09:25

在SQL Server 2005/2008中显示SELECT查询结果中的行号:

SELECT ( ROW_NUMBER() OVER (ORDER BY OrderId) ) AS RowNumber,
        GrandTotal, CustomerId, PurchaseDate
FROM Orders

ORDER BY是一个强制性条款。OVER()子句告诉SQL引擎对指定列(在本例中为OrderId)上的数据进行排序，并根据排序结果分配数字。

2009-02-10 15:22:30

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

SQL Server的隐藏特性

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