Question

我想要一个脚本来删除名称以给定字符串开头的所有表。我确信这可以通过一些动态sql和INFORMATION_SCHEMA表来完成。

如果有人有脚本，或者可以快速敲门，请发布。

如果在我弄清楚之前没有人发布答案，我会发布我的解决方案。

Answer 1

如果数据库中有多个查询，则可能需要修改查询以包含所有者。

DECLARE @cmd varchar(4000)
DECLARE cmds CURSOR FOR
SELECT 'drop table [' + Table_Name + ']'
FROM INFORMATION_SCHEMA.TABLES
WHERE Table_Name LIKE 'prefix%'

OPEN cmds
WHILE 1 = 1
BEGIN
    FETCH cmds INTO @cmd
    IF @@fetch_status != 0 BREAK
    EXEC(@cmd)
END
CLOSE cmds;
DEALLOCATE cmds

这比使用生成脚本和运行的两步法更简洁。但是脚本生成的一个优点是，它使您有机会在实际运行之前查看将要运行的全部内容。

我知道如果我打算对生产数据库这样做，我会尽可能小心。

编辑代码示例已修复。

Answer 2

SELECT 'DROP TABLE "' + TABLE_NAME + '"' 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '[prefix]%'

这将生成一个脚本。

在删除之前添加子句以检查表的存在：

SELECT 'IF OBJECT_ID(''' +TABLE_NAME + ''') IS NOT NULL BEGIN DROP TABLE [' + TABLE_NAME + '] END;' 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '[prefix]%'

Answer 3

这将以外键顺序获取表，并避免删除SQL Server创建的一些表。 t.Ordinal值会将表切片为依赖关系层。

WITH TablesCTE(SchemaName, TableName, TableID, Ordinal) AS
(
    SELECT OBJECT_SCHEMA_NAME(so.object_id) AS SchemaName,
        OBJECT_NAME(so.object_id) AS TableName,
        so.object_id AS TableID,
        0 AS Ordinal
    FROM sys.objects AS so
    WHERE so.type = 'U'
        AND so.is_ms_Shipped = 0
        AND OBJECT_NAME(so.object_id)
        LIKE 'MyPrefix%'

    UNION ALL
    SELECT OBJECT_SCHEMA_NAME(so.object_id) AS SchemaName,
        OBJECT_NAME(so.object_id) AS TableName,
        so.object_id AS TableID,
        tt.Ordinal + 1 AS Ordinal
    FROM sys.objects AS so
        INNER JOIN sys.foreign_keys AS f
            ON f.parent_object_id = so.object_id
                AND f.parent_object_id != f.referenced_object_id
        INNER JOIN TablesCTE AS tt
            ON f.referenced_object_id = tt.TableID
    WHERE so.type = 'U'
        AND so.is_ms_Shipped = 0
        AND OBJECT_NAME(so.object_id)
        LIKE 'MyPrefix%'
)
SELECT DISTINCT t.Ordinal, t.SchemaName, t.TableName, t.TableID
FROM TablesCTE AS t
    INNER JOIN
    (
        SELECT
            itt.SchemaName AS SchemaName,
            itt.TableName AS TableName,
            itt.TableID AS TableID,
            Max(itt.Ordinal) AS Ordinal
        FROM TablesCTE AS itt
        GROUP BY itt.SchemaName, itt.TableName, itt.TableID
    ) AS tt
        ON t.TableID = tt.TableID
            AND t.Ordinal = tt.Ordinal
ORDER BY t.Ordinal DESC, t.TableName ASC

Answer 4

在Oracle XE上，这可行：

SELECT 'DROP TABLE "' || TABLE_NAME || '";'
FROM USER_TABLES
WHERE TABLE_NAME LIKE 'YOURTABLEPREFIX%'

或者如果你想删除约束并释放空间，请使用：

SELECT 'DROP TABLE "' || TABLE_NAME || '" cascade constraints PURGE;'
FROM USER_TABLES
WHERE TABLE_NAME LIKE 'YOURTABLEPREFIX%'

这将生成一堆DROP TABLE cascade constraints PURGE语句......

VIEWS使用此：

SELECT 'DROP VIEW "' || VIEW_NAME || '";'
FROM USER_VIEWS
WHERE VIEW_NAME LIKE 'YOURVIEWPREFIX%'

Answer 5

EXEC sp_MSforeachtable 'if PARSENAME("?",1) like ''%CertainString%'' DROP TABLE ?'

修改

sp_MSforeachtable未记录，因此不适合生产，因为它的行为可能因MS_SQL版本而异。

Answer 6

CREATE PROCEDURE usp_GenerateDROP
    @Pattern AS varchar(255)
    ,@PrintQuery AS bit
    ,@ExecQuery AS bit
AS
BEGIN
    DECLARE @sql AS varchar(max)

    SELECT @sql = COALESCE(@sql, '') + 'DROP TABLE [' + TABLE_NAME + ']' + CHAR(13) + CHAR(10)
    FROM INFORMATION_SCHEMA.TABLES
    WHERE TABLE_NAME LIKE @Pattern

    IF @PrintQuery = 1 PRINT @sql
    IF @ExecQuery = 1 EXEC (@sql)
END

Answer 7

当我在寻找mysql语句来删除基于@Xenph Yan的所有WordPress表时，我看到了这篇文章，这是我最终做的：

SELECT CONCAT(  'DROP TABLE `', TABLE_NAME,  '`;' ) AS query
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE  'wp_%'

这将为您提供以wp _

开头的所有表的drop查询集

Answer 8

Xenph Yan的回答比我的清楚得多，但我的一切都是一样的。

DECLARE @startStr AS Varchar (20)
SET @startStr = 'tableName'

DECLARE @startStrLen AS int
SELECT @startStrLen = LEN(@startStr)

SELECT 'DROP TABLE ' + name FROM sysobjects
WHERE type = 'U' AND LEFT(name, @startStrLen) = @startStr

只需将tableName更改为您要搜索的字符。

Answer 9

这是我的解决方案：

SELECT CONCAT('DROP TABLE `', TABLE_NAME,'`;') 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE 'TABLE_PREFIX_GOES_HERE%';

当然，您需要将TABLE_PREFIX_GOES_HERE替换为您的前缀。

Answer 10

这对我有用。

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

SELECT @sql += '
DROP TABLE ' 
    + QUOTENAME(s.name)
    + '.' + QUOTENAME(t.name) + ';'
    FROM sys.tables AS t
    INNER JOIN sys.schemas AS s
    ON t.[schema_id] = s.[schema_id] 
    WHERE t.name LIKE 'something%';

PRINT @sql;
-- EXEC sp_executesql @sql;

Answer 11

谢谢Curt，这就是我在自己中途的那种解决方案。

你的比我更好 - 它有助于轻松修改。我在选择中添加了一个联合并删除了一些视图;）

declare @cmd varchar(4000)
declare cmds cursor for 
Select 'drop table [' + Table_Name + ']'
From    INFORMATION_SCHEMA.TABLES
Where   Table_Name like 'prefix%'
union
Select 'drop view [' + Table_Name + ']'
From    INFORMATION_SCHEMA.VIEWS
Where   Table_Name like 'prefix%'
open cmds
while 1=1
begin
    fetch cmds into @cmd
    if @@fetch_status != 0 break
    exec(@cmd)
end
close local
deallocate local

别担心，它不是一个生产数据库 - 这只是为了在我尝试填充时轻松清理我的dev db。

Answer 12

select 'DROP TABLE ' + name from sysobjects
where type = 'U' and sysobjects.name like '%test%'

- 测试是表名

Answer 13

SELECT 'if object_id(''' + TABLE_NAME + ''') is not null begin drop table "' + TABLE_NAME + '" end;' 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE '[prefix]%'

Answer 14

我不得不对Xenph Yan的答案做一点推理，我怀疑因为我的表没有默认架构。

SELECT 'DROP TABLE Databasename.schema.' + TABLE_NAME 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_NAME LIKE 'strmatch%'

Answer 15

如果是临时表，您可能需要尝试

SELECT 'DROP TABLE "' + t.name + '"' 
FROM tempdb.sys.tables t
WHERE t.name LIKE '[prefix]%'

Answer 16

我想发布我的解决方案提案，该解决方案基于超过特定天数的通配符（例如“table_20210114”）删除（不仅仅是生成和选择删除命令）所有表。

DECLARE 
    @drop_command NVARCHAR(MAX) = '',
    @system_time date,
    @table_date nvarchar(8),
    @older_than int = 7
    
Set @system_time = (select getdate() - @older_than)
Set @table_date = (SELECT CONVERT(char(8), @system_time, 112))

SELECT @drop_command += N'DROP TABLE ' + QUOTENAME(SCHEMA_NAME(schema_id)) + '.' + QUOTENAME([Name]) + ';'
FROM <your_database_name>.sys.tables
WHERE [Name] LIKE 'table_%' AND RIGHT([Name],8) < @table_date

SELECT @drop_command
 
EXEC sp_executesql @drop_command

删除名称以某个字符串开头的所有表

16 个答案: