MySQL Dropping Tables

Question

What syntax for MySQL would I use to drop multiple tables that have a similar pattern to them? Something like:

DROP TABLES FROM `Database1` LIKE "SubTable*"

Answer 1

Since DROP TABLE was supported by prepared statements, it can be done in this way -

SET @tables = NULL;
SELECT GROUP_CONCAT(table_schema, '.', table_name) INTO @tables FROM information_schema.tables 
  WHERE table_schema = 'Database1' AND table_name LIKE 'SubTable%';

SET @tables = CONCAT('DROP TABLE ', @tables);
PREPARE stmt1 FROM @tables;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;

Answer 2

正如在这个问题上所指出的，这里给出的答案（Angelin和Devart）在没有首先增加group_concat限制的情况下不会在所有情况下起作用，如下所示：

SET group_concat_max_len = 1024 * 1024 * 10;

Answer 3

No. But you can select tables names from information_schema database:

select table_name
  from information_schema.tables
 where table_schema = 'Database1'
   and table_name like 'SubTable%'

And after that iterate the table names in result set and drop them

Answer 4

mysql> SELECT CONCAT( "DROP TABLE ", GROUP_CONCAT(TABLE_NAME) ) AS stmt

FROM information_schema.TABLES

WHERE TABLE_SCHEMA = "your_db_name" AND TABLE_NAME LIKE "ur condition" into outfile '/tmp/a.txt';

mysql> source /tmp/a.txt;