编辑：

Question

我有一堆数据库表，我想删除所有数据库。我的脚本如下......但是当我尝试运行时，我创建了一个无限循环。

我有什么想法可以做到这一点？

/* Drop all tables */
DECLARE @name VARCHAR(128)
DECLARE @SQL VARCHAR(254)

SELECT @name = (SELECT TOP 1 [name] FROM sysobjects 
                WHERE [type] = 'U' AND category = 0 ORDER BY [name])

WHILE @name IS NOT NULL 
IF @name !=  'tableNotToBeDropped'
BEGIN
    SELECT @SQL = 'DROP TABLE [dbo].[' + RTRIM(@name) +']'
    EXEC (@SQL)
    PRINT 'Dropped Table: ' + @name
    SELECT @name = (SELECT TOP 1 [name] FROM sysobjects  
                    WHERE [type] = 'U' AND category = 0 AND [name] > @name 
                    ORDER BY [name])
END
GO

Answer 1

根本不需要循环。 DROP TABLE可以使用一个语句删除多个表：

DECLARE @tables NVARCHAR(MAX) = 
         STUFF((SELECT ',' + QUOTENAME([table_name]) AS [text()]  
               FROM INFORMATION_SCHEMA.TABLES
               WHERE table_schema = 'dbo' 
               AND TABLE_NAME <> 'tableNotToBeDropped'
               FOR XML PATH('')),1,1,'');

DECLARE @sql NVARCHAR(MAX) = 'DROP TABLE ' + @tables;

-- debug
SELECT @sql;

EXEC sp_executesql @sql;

的 LiveDemo

工作原理：

获取除一个
之外的特定架构的所有表名
创建逗号分隔列表

删除表

请记住，如果您的表定义了外键，则丢弃的顺序很重要。

编辑：

SQL Server 2017版：

DECLARE @sql NVARCHAR(MAX) = 'DROP TABLE IF EXISTS ' + (SELECT string_agg(QUOTENAME(table_name), ',') FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = 'dbo' AND TABLE_NAME <> 'tableNotToBeDropped' AND TABLE_NAME LIKE 't%'); SELECT @sql; EXEC sp_executesql @sql;

<强> DBFiddle Demo

Answer 2

这一个班轮也有效：

sp_MSforeachtable @command1='IF OBJECT_ID(''?'') NOT IN (OBJECT_ID(''TableToNotDelete'')) DROP TABLE ?'

Answer 3

我建议您使用游标，并将名称不等于游标查询的where子句。

http://www.kodyaz.com/articles/sql-cursor-example-tables-rows-count-using-sql-server-cursor.aspx

如何删除除1之外的所有表

3 个答案:

编辑：