SQL:删除带有前缀的表

发布于 2024-08-08 10:08:13 字数 74 浏览 5 评论 0原文

如何删除我的所有带有 myprefix_ 前缀的表?

注意:需要在phpMyAdmin中执行

How to delete my tables who all have the prefix myprefix_?

Note: need to execute it in phpMyAdmin

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友谊不毕业 2024-08-15 10:08:14
show tables like 'prefix_%';

复制结果并将其粘贴到文本编辑器中或将查询输出到文件中,使用一些搜索和替换来删除不需要的格式并将 \n 替换为逗号
在末尾添加 ; 并在前面添加 drop table。

你会得到类似这样的东西:

drop table myprefix_1, myprefix_2, myprefix_3;
show tables like 'prefix_%';

copy the results and paste them into a text editor or output the query to a file, use a few search and replaces to remove unwanted formatting and replace \n with a comma
put a ; on the end and add drop table to the front.

you'll get something that looks like this:

drop table myprefix_1, myprefix_2, myprefix_3;
浅语花开 2024-08-15 10:08:14

@andre-miller 解决方案很好,但还有更好的和稍微的更专业,将帮助您一次性执行所有操作。仍然需要多个命令,但这一解决方案将允许您使用 SQL 进行自动构建。

SET @tbls = (SELECT GROUP_CONCAT(TABLE_NAME) 
    FROM information_schema.TABLES
    WHERE TABLE_NAME LIKE 'myprefix_%');
PREPARE stmt FROM 'DROP TABLE @tbls';
EXECUTE stmt USING @tbls;
DEALLOCATE PREPARE stmt;

注意:此代码与平台相关,它适用于 MySQL,但可以肯定的是,只需稍作更改即可适用于 Postgre、Oracle 和 MS SQL。

@andre-miller solution is good but there is even better and slightly more professional that will help you execute all in one go. Still will need more than one command but this solution will allow you to use the SQL for automated builds.

SET @tbls = (SELECT GROUP_CONCAT(TABLE_NAME) 
    FROM information_schema.TABLES
    WHERE TABLE_NAME LIKE 'myprefix_%');
PREPARE stmt FROM 'DROP TABLE @tbls';
EXECUTE stmt USING @tbls;
DEALLOCATE PREPARE stmt;

Note: this code is platform dependant, it's for MySQL but for sure it could be implemented for Postgre, Oracle and MS SQL with slight changes.

不必你懂 2024-08-15 10:08:14
SELECT CONCAT("DROP TABLE ", table_name, ";") 
FROM information_schema.tables
WHERE table_schema = "DATABASE_NAME" 
AND table_name LIKE "PREFIX_TABLE_NAME%";
SELECT CONCAT("DROP TABLE ", table_name, ";") 
FROM information_schema.tables
WHERE table_schema = "DATABASE_NAME" 
AND table_name LIKE "PREFIX_TABLE_NAME%";
向地狱狂奔 2024-08-15 10:08:14

我通过编辑查询成功删除表,如下所示

SET GROUP_CONCAT_MAX_LEN=10000;
SET FOREIGN_KEY_CHECKS = 0;
SET @tbls = (SELECT GROUP_CONCAT(CONCAT('`', TABLE_NAME, '`'))
           FROM information_schema.TABLES
          WHERE TABLE_SCHEMA = 'pandora'
            AND TABLE_NAME LIKE 'temp_%');
SET @delStmt = CONCAT('DROP TABLE ',  @tbls);
-- SELECT @delStmt;
PREPARE stmt FROM @delStmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET FOREIGN_KEY_CHECKS = 1;

I drop table successfully by edit query to like this

SET GROUP_CONCAT_MAX_LEN=10000;
SET FOREIGN_KEY_CHECKS = 0;
SET @tbls = (SELECT GROUP_CONCAT(CONCAT('`', TABLE_NAME, '`'))
           FROM information_schema.TABLES
          WHERE TABLE_SCHEMA = 'pandora'
            AND TABLE_NAME LIKE 'temp_%');
SET @delStmt = CONCAT('DROP TABLE ',  @tbls);
-- SELECT @delStmt;
PREPARE stmt FROM @delStmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET FOREIGN_KEY_CHECKS = 1;
善良天后 2024-08-15 10:08:14

这是使用 GROUP_CONCAT 的另一种解决方案,因此它将执行一个删除查询,例如
删除表表1,表2,..

SET @Drop_Stm = CONCAT('DROP TABLE ', (
      SELECT GROUP_CONCAT(TABLE_NAME) AS All_Tables FROM information_schema.tables 
      WHERE TABLE_NAME LIKE 'prefix_%' AND TABLE_SCHEMA = 'database_name'
)); 
PREPARE Stm FROM @Drop_Stm; 
EXECUTE Stm;
DEALLOCATE PREPARE Stm;

Just another solution using GROUP_CONCAT so it will execute one drop query like
DROP TABLE table1,table2,..

SET @Drop_Stm = CONCAT('DROP TABLE ', (
      SELECT GROUP_CONCAT(TABLE_NAME) AS All_Tables FROM information_schema.tables 
      WHERE TABLE_NAME LIKE 'prefix_%' AND TABLE_SCHEMA = 'database_name'
)); 
PREPARE Stm FROM @Drop_Stm; 
EXECUTE Stm;
DEALLOCATE PREPARE Stm;
凹づ凸ル 2024-08-15 10:08:14

您可以使用 MySQL 通过一个命令来完成此操作:

drop table myprefix_1, myprefix_2, myprefix_3;

不过,您可能必须在代码中动态构建表列表。

另一种方法是使用 通用例程库 对于 MySQL 5。

You can do that in one command with MySQL:

drop table myprefix_1, myprefix_2, myprefix_3;

You'll probably have to build the table list dynamically in code though.

An alternative approach would be to use the general purpose routine library for MySQL 5.

唐婉 2024-08-15 10:08:14

我只是想发布我使用的确切 SQL - 它是前 3 个答案的混合体:

SET GROUP_CONCAT_MAX_LEN=10000;

SET @del = (
    SELECT      CONCAT('DROP TABLE ', GROUP_CONCAT(TABLE_NAME), ';')
    FROM        information_schema.TABLES

    WHERE       TABLE_SCHEMA = 'database_name'
    AND         TABLE_NAME LIKE 'prefix_%'
);

PREPARE stmt FROM @del;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

I just wanted to post the exact SQL I used - it's something of a mixture of the top 3 answers:

SET GROUP_CONCAT_MAX_LEN=10000;

SET @del = (
    SELECT      CONCAT('DROP TABLE ', GROUP_CONCAT(TABLE_NAME), ';')
    FROM        information_schema.TABLES

    WHERE       TABLE_SCHEMA = 'database_name'
    AND         TABLE_NAME LIKE 'prefix_%'
);

PREPARE stmt FROM @del;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
童话 2024-08-15 10:08:14

我发现准备好的语句对我来说有点棘手,但是当您有很多表时,设置 GROUP_CONCAT_MAX_LEN 是必不可少的。这导致了一个简单的三步过程,从mysql命令行进行剪切和粘贴,这对我来说非常有用:

SET GROUP_CONCAT_MAX_LEN=10000;
SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' ) 
    AS statement FROM information_schema.tables 
    WHERE table_name LIKE 'myprefix_%';

然后小心地剪切并粘贴生成的长DROP陈述。

I found that the prepared statements were a little tricky to get working for me but setting the GROUP_CONCAT_MAX_LEN was essential when you have a lot of tables. This resulted in a simple three-step process with cut-and paste from the mysql command line that worked great for me:

SET GROUP_CONCAT_MAX_LEN=10000;
SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' ) 
    AS statement FROM information_schema.tables 
    WHERE table_name LIKE 'myprefix_%';

Then carefully cut-and-paste the resulting long DROP statement.

你没皮卡萌 2024-08-15 10:08:13

您不能仅使用单个 MySQL 命令来完成此操作,但是您可以使用 MySQL 为您构建语句:

在 MySQL shell 中或通过 PHPMyAdmin,使用以下查询

SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' ) 
    AS statement FROM information_schema.tables 
    WHERE table_name LIKE 'myprefix_%';

这将生成一个 DROP 语句,您可以复制并执行该语句来删除桌子。

编辑:这里的免责声明 - 上面生成的语句将删除所有数据库中具有该前缀的所有表。如果您想将其限制为特定数据库,请将查询修改为如下所示,并将database_name替换为您自己的database_name:

SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' ) 
    AS statement FROM information_schema.tables 
    WHERE table_schema = 'database_name' AND table_name LIKE 'myprefix_%';

You cannot do it with just a single MySQL command, however you can use MySQL to construct the statement for you:

In the MySQL shell or through PHPMyAdmin, use the following query

SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' ) 
    AS statement FROM information_schema.tables 
    WHERE table_name LIKE 'myprefix_%';

This will generate a DROP statement which you can than copy and execute to drop the tables.

EDIT: A disclaimer here - the statement generated above will drop all tables in all databases with that prefix. If you want to limit it to a specific database, modify the query to look like this and replace database_name with your own database_name:

SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' ) 
    AS statement FROM information_schema.tables 
    WHERE table_schema = 'database_name' AND table_name LIKE 'myprefix_%';
番薯 2024-08-15 10:08:13

之前的一些回答都说得非常好。
我将他们的想法与一些人结合起来
网络上其他答案的概念。

我需要删除所有以“temp_”开头的表
经过几次迭代后,我想出了这段代码:

-- Set up variable to delete ALL tables starting with 'temp_'
SET GROUP_CONCAT_MAX_LEN=10000;
SET @tbls = (SELECT GROUP_CONCAT(TABLE_NAME)
               FROM information_schema.TABLES
              WHERE TABLE_SCHEMA = 'my_database'
                AND TABLE_NAME LIKE 'temp_%');
SET @delStmt = CONCAT('DROP TABLE ',  @tbls);
-- SELECT @delStmt;
PREPARE stmt FROM @delStmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

我希望这对其他 MySQL/PHP 程序员有用。

Some of the earlier answers were very good.
I have pulled together their ideas with some
notions from other answers on the web.

I needed to delete all tables starting with 'temp_'
After a few iterations I came up with this block of code:

-- Set up variable to delete ALL tables starting with 'temp_'
SET GROUP_CONCAT_MAX_LEN=10000;
SET @tbls = (SELECT GROUP_CONCAT(TABLE_NAME)
               FROM information_schema.TABLES
              WHERE TABLE_SCHEMA = 'my_database'
                AND TABLE_NAME LIKE 'temp_%');
SET @delStmt = CONCAT('DROP TABLE ',  @tbls);
-- SELECT @delStmt;
PREPARE stmt FROM @delStmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

I hope this is useful to other MySQL/PHP programmers.

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