不要这样做!真的，这不是个好主意。

如果知道要截断哪些表，可以创建一个存储过程来截断它们。您可以修复顺序以避免外键问题。

如果您真的想要截断它们(例如，您可以BCP加载它们)，那么您可以很快地删除数据库并从头创建一个新的数据库，这将带来额外的好处，即您可以确切地知道您所处的位置。

当处理从具有外键关系的表中删除数据时(这基本上是任何设计良好的数据库的情况)，我们可以禁用所有约束，删除所有数据，然后重新启用约束

-- disable all constraints
EXEC sp_MSForEachTable "ALTER TABLE ? NOCHECK CONSTRAINT all"

-- delete data in all tables
EXEC sp_MSForEachTable "DELETE FROM ?"

-- enable all constraints
exec sp_MSForEachTable "ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all"

这里有更多关于禁用约束和触发器的信息

如果某些表有标识列，我们可能需要重新播种它们

EXEC sp_MSForEachTable "DBCC CHECKIDENT ( '?', RESEED, 0)"

请注意，RESEED的行为在全新的表和之前从BOL中插入了一些数据的表之间有所不同:

DBCC CHECKIDENT ('table_name', RESEED, newReseedValue) The current identity value is set to the newReseedValue. If no rows have been inserted to the table since it was created, the first row inserted after executing DBCC CHECKIDENT will use newReseedValue as the identity. Otherwise, the next row inserted will use newReseedValue + 1. If the value of newReseedValue is less than the maximum value in the identity column, error message 2627 will be generated on subsequent references to the table.

感谢Robert指出禁用约束不允许使用截断的事实，约束必须被删除，然后重新创建

对于SQL 2005，

EXEC sp_MSForEachTable 'TRUNCATE TABLE ?'

2000年和2005/2008年的链接更多。

这是数据库擦除脚本之王。它将清除所有表并正确地重新播种:

SET QUOTED_IDENTIFIER ON;
EXEC sp_MSforeachtable 'SET QUOTED_IDENTIFIER ON; ALTER TABLE ? NOCHECK CONSTRAINT ALL'  
EXEC sp_MSforeachtable 'SET QUOTED_IDENTIFIER ON; ALTER TABLE ? DISABLE TRIGGER ALL'  
EXEC sp_MSforeachtable 'SET QUOTED_IDENTIFIER ON; DELETE FROM ?'  
EXEC sp_MSforeachtable 'SET QUOTED_IDENTIFIER ON; ALTER TABLE ? CHECK CONSTRAINT ALL'  
EXEC sp_MSforeachtable 'SET QUOTED_IDENTIFIER ON; ALTER TABLE ? ENABLE TRIGGER ALL' 
EXEC sp_MSforeachtable 'SET QUOTED_IDENTIFIER ON';

IF NOT EXISTS (
    SELECT
        *
    FROM
        SYS.IDENTITY_COLUMNS
        JOIN SYS.TABLES ON SYS.IDENTITY_COLUMNS.Object_ID = SYS.TABLES.Object_ID
    WHERE
        SYS.TABLES.Object_ID = OBJECT_ID('?') AND SYS.IDENTITY_COLUMNS.Last_Value IS NULL
)
AND OBJECTPROPERTY( OBJECT_ID('?'), 'TableHasIdentity' ) = 1

    DBCC CHECKIDENT ('?', RESEED, 0) WITH NO_INFOMSGS;

享受吧，但要小心!

我喜欢在MSSQL Server developer或Enterprise中使用的另一个选项是在创建空模式后立即创建数据库快照。此时，您可以继续将数据库恢复到快照。

截断所有表最困难的部分是删除和读取外键约束。

下面的查询为与@myTempTable中的每个表名相关的每个约束创建了drop & create语句。如果希望为所有表生成这些表名，可以简单地使用信息模式来收集这些表名。

DECLARE @myTempTable TABLE (tableName varchar(200))
INSERT INTO @myTempTable(tableName) VALUES
('TABLE_ONE'),
('TABLE_TWO'),
('TABLE_THREE')


-- DROP FK Contraints
SELECT 'alter table '+quotename(schema_name(ob.schema_id))+
  '.'+quotename(object_name(ob.object_id))+ ' drop constraint ' + quotename(fk.name) 
  FROM sys.objects ob INNER JOIN sys.foreign_keys fk ON fk.parent_object_id = ob.object_id
  WHERE fk.referenced_object_id IN 
      (
         SELECT so.object_id 
         FROM sys.objects so JOIN sys.schemas sc
         ON so.schema_id = sc.schema_id
         WHERE so.name IN (SELECT * FROM @myTempTable)  AND sc.name=N'dbo'  AND type in (N'U'))


 -- CREATE FK Contraints
 SELECT 'ALTER TABLE [PIMSUser].[dbo].[' +cast(c.name as varchar(255)) + '] WITH NOCHECK ADD CONSTRAINT ['+ cast(f.name as varchar(255)) +'] FOREIGN KEY (['+ cast(fc.name as varchar(255)) +'])
      REFERENCES [PIMSUser].[dbo].['+ cast(p.name as varchar(255)) +'] (['+cast(rc.name as varchar(255))+'])'
FROM  sysobjects f
      INNER JOIN sys.sysobjects c ON f.parent_obj = c.id
      INNER JOIN sys.sysreferences r ON f.id = r.constid
      INNER JOIN sys.sysobjects p ON r.rkeyid = p.id
      INNER JOIN sys.syscolumns rc ON r.rkeyid = rc.id and r.rkey1 = rc.colid
      INNER JOIN sys.syscolumns fc ON r.fkeyid = fc.id and r.fkey1 = fc.colid
WHERE 
      f.type = 'F'
      AND
      cast(p.name as varchar(255)) IN (SELECT * FROM @myTempTable)

然后，我只是复制语句来运行—但是稍加开发工作，您就可以使用游标来动态地运行它们。