Method 2: Drop All Tables In One Script An answer on StackOverflowherehas also provided a method for dropping all MySQL tables without the manual step of copying and pasting the Drop Table statements: SETFOREIGN
dFROMEmployees eJOINDepartment dONe.department_id=d.department_idWHEREd.name='Sales';--remove from all tables (in this case same as previous)DELETEFROMEmployees eJOINDepartment dONe.department_id=d.department_idWHEREd.name='
适用场景:MyISAM Tables Why: MyISAM删除的数据维护在一个链表中,这些空间和行的位置接下来会被Insert的数据复用。 直接的delete后,mysql会合并索引块,涉及大量内存的拷贝移动;而OPTIMIZE TABLE直接重建索引,即直接把数据块情况,再重新搞一份(联想JVM垃圾回收算法)。 运行效果:删除时间大3个半小时提高到了1小时40分...
dFROMEmployees eJOINDepartment dONe.department_id=d.department_idWHERE='Sales';--remove from all tables (in this case same as previous)DELETEFROMEmployees eJOINDepartment dONe.department_id=d.department_idWHERE='Sales';
接下来,我们需要获取当前数据库中的所有表和这些表的索引。我们可以使用SHOW TABLES和SHOW INDEXES语句来实现这一功能。下面是获取表和索引的代码示例: # 获取所有表defget_tables(conn):cursor=conn.cursor()cursor.execute("SHOW TABLES")tables=cursor.fetchall()cursor.close()return[table[0]fortableintables]...
character-set-server=utf8default-storage-engine=INNODBsql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES[mysql]#编码default-character-set=utf8 4.cmd 以管理员身份运行: 进入安装目录下bin根目录下 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
以为只有一种解法-skip-grant-tables。 星哥玩云 2022/08/16 3210 设置mysql密码(5.6/5.7)、远程数据库、常用命令 云数据库 SQL Server数据库sqlsocket 首次直接使用mysql会提示‘该命令不’,原因是还没有将该命令加入环境变量,如果要使用该命令,需要使用其绝对路径:/usr/local/mysql/bin/mysql,为了方便...
适用场景:MyISAM Tables Why:MyISAM删除的数据维护在一个链表中,这些空间和行的位置接下来会被Insert的数据复用。 直接的delete后,mysql会合并索引块,涉及大量内存的拷贝移动;而OPTIMIZE TABLE直接重建索引,即直接把数据块清空,再重新搞一份(联想JVM垃圾回收算法)。
22.4.4.4 Delete Tables You can use the delete() method to remove some or all records from a table in a database. The X DevAPI provides additional methods to use with the delete() method to filter and order the records to be deleted. ...
We’ve created four tables named test1, test2, test3 and test4 with the same table structure. Suppose you want to remove all test* tables at a time, you can follow the steps below: First, you declare two variables that accept database schema and a pattern that you want to the tables...