Azure SQL +表(带约束)的模式与dbo + ipv6_database_firewall_rules条件不同。

这是一个小扩展https://stackoverflow.com/a/43128914/4510954的答案。

DECLARE @sql NVARCHAR(2000)

WHILE(EXISTS(SELECT 1 from INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE CONSTRAINT_TYPE='FOREIGN KEY'))
BEGIN
    SELECT TOP 1 @sql=('ALTER TABLE ' + CONSTRAINT_SCHEMA + '.[' + TABLE_NAME + '] DROP CONSTRAINT [' + CONSTRAINT_NAME + ']')
    FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS
    WHERE CONSTRAINT_TYPE = 'FOREIGN KEY'
    EXEC(@sql)
    PRINT @sql
END

WHILE(EXISTS(SELECT * from INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME != '__MigrationHistory' AND TABLE_NAME != 'database_firewall_rules' AND TABLE_NAME != 'ipv6_database_firewall_rules'))
BEGIN
    SELECT TOP 1 @sql=('DROP TABLE ' + CONSTRAINT_SCHEMA  + '.[' + TABLE_NAME + ']')
    FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS
    WHERE TABLE_NAME != '__MigrationHistory' AND TABLE_NAME != 'database_firewall_rules'
    EXEC(@sql)
    PRINT @sql
END

我知道这是一篇老文章了，但我已经在大量的数据库上尝试了所有的答案，我发现它们有时都有效，但不是所有时间都适用于SQL Server的各种(我只能假设)怪癖。

最后我想到了这个。我在任何地方都测试过这个(一般来说)，它是有效的(没有任何隐藏的存储过程)。

主要用于SQL Server 2014。(但我尝试过的大多数其他版本似乎也很好)。

我尝试过while循环和null等，游标和其他各种形式，但它们似乎总是在一些数据库上失败，而不是其他没有明显的原因。

获得一个计数并使用它进行迭代似乎总是适用于我测试的所有内容。

USE [****YOUR_DATABASE****]
GO

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

-- Drop all referential integrity constraints --
-- Drop all Primary Key constraints.          --

DECLARE @sql  NVARCHAR(296)
DECLARE @table_name VARCHAR(128)

DECLARE @constraint_name VARCHAR(128)
SET @constraint_name = ''

DECLARE @row_number INT

SELECT @row_number = Count(*) FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc1
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc2 ON tc2.CONSTRAINT_NAME = rc1.CONSTRAINT_NAME

WHILE @row_number > 0
BEGIN
    BEGIN
        SELECT TOP 1 @table_name = tc2.TABLE_NAME, @constraint_name = rc1.CONSTRAINT_NAME FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc1
        LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc2 ON tc2.CONSTRAINT_NAME = rc1.CONSTRAINT_NAME
        AND rc1.CONSTRAINT_NAME > @constraint_name
        ORDER BY rc1.CONSTRAINT_NAME
        SELECT @sql = 'ALTER TABLE [dbo].[' + RTRIM(@table_name) +'] DROP CONSTRAINT [' + RTRIM(@constraint_name)+']'
        EXEC (@sql)
        PRINT 'Dropped Constraint: ' + @constraint_name + ' on ' + @table_name
        SET @row_number = @row_number - 1
    END
END
GO

-- Drop all tables --

DECLARE @sql  NVARCHAR(156)
DECLARE @name VARCHAR(128)
SET @name = ''

DECLARE @row_number INT

SELECT @row_number = Count(*) FROM sysobjects WHERE [type] = 'U' AND category = 0

WHILE @row_number > 0
BEGIN
    SELECT @name = (SELECT TOP 1 [name] FROM sysobjects WHERE [type] = 'U' AND category = 0 AND [name] > @name ORDER BY [name])
    SELECT @sql = 'DROP TABLE [dbo].[' + RTRIM(@name) +']'
    EXEC (@sql)
    PRINT 'Dropped Table: ' + @name
    SET @row_number = @row_number - 1
END
GO

Delete用于从表中删除行。你应该用drop table代替。

EXEC sp_msforeachtable 'drop table [?]'

对我来说，最简单的方法是:

--First delete all constraints

DECLARE @sql NVARCHAR(MAX);
SET @sql = N'';

SELECT @sql = @sql + N'
ALTER TABLE ' + QUOTENAME(s.name) + N'.'
+ QUOTENAME(t.name) + N' DROP CONSTRAINT '
+ QUOTENAME(c.name) + ';'
FROM sys.objects AS c
INNER JOIN sys.tables AS t
ON c.parent_object_id = t.[object_id]
INNER JOIN sys.schemas AS s 
ON t.[schema_id] = s.[schema_id]
WHERE c.[type] IN ('D','C','F','PK','UQ')
ORDER BY c.[type];

EXEC sys.sp_executesql @sql;

-- Then drop all tables

exec sp_MSforeachtable 'DROP TABLE ?'

看来这个命令应该不带方巾

EXEC sp_msforeachtable 'drop table ?'

您也可以只使用MSSMS UI工具(不使用SQL脚本)从数据库中删除所有表。有时这种方式会更舒服(尤其是偶尔这样做的时候)

我是这样一步一步做的:

在数据库树中选择“Tables”(对象资源管理器) 按F7打开对象资源管理器详细信息视图 在这个视图中选择必须删除的表(在本例中是所有表) 一直按Delete键，直到所有表都被删除(重复该操作的次数与由于键约束/依赖导致的错误数量相同)