如何删除除1之外的所有表

Question

我有一堆数据库表,我想删除除了一个.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;

LiveDemo

这个怎么运作:

1. 从一个特定模式获取所有表名称
2. 创建逗号分隔列表
3. 删除表

请记住,如果您的表已定义外键,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;

DBFiddle演示