MySQL DELETE 语句 你可以使用 DELETE FROM 命令来删除 MySQL 数据表中的记录。 你可以在 mysql> 命令提示符或 PHP 脚本中执行该命令。 语法 以下是 DELETE 语句从 MySQL 数据表中删除数据的通用语法: DELETE FROM table_name WHERE condition; 参数说明: table_nam
[LIMIT row_count] /* 说明: (1) ORDER BY:按照指定的顺序对行删除操作。 (2) LIMIT:限制可删除的行数。 */ 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 1、删除满足指定条件的记录 mysql> select * from emp; +---+---+---+---+---+---+---+ | e_id | e_name | gender | jobti...
--需要归档的数据量mysql admin@192.168.58.3:employees>selectcount(*)fromemployeeswherefirst_name='Anneke';+---+|count(*)|+---+|225|+---+1rowinsetTime:0.025s--执行归档操作# pt-archiver--source h=192.168.58.3,P=3306,u=admin,D=employees,t=employees,A=utf8 --dest h=192.168.58.3,P=3...
(Supported in all NDB releases based on MySQL 8.0) --core-file Write core file on error; used in debugging REMOVED: 8.0.31 --database=name, -d name Name of the database in which the table is found (Supported in all NDB releases based on MySQL 8.0) ...
4 lock struct(s), heap size 1184, 3 row lock(s), undo log entries 1 MySQL thread id 1, OS thread handle 0x7f61ab1c7700, query id 104 localhost msandbox cleaning up TABLE LOCK table `test`.`t` trx id 146749 lock mode IX
--- 3.2 修改表的行格式ALTERTABLEt1ROW_FORMAT=COMPRESSED;--- 3.3 重置表的自增数ALTERTABLEt1A...
DELETEFROMusersWHEREuser_idNOTIN(SELECTuser_idFROMorders); 1. 2.3 限制删除条目数量 大规模删除数据时,直接执行大规模的DELETE可能会导致性能问题或甚至引起数据库锁的问题,建议采取分批删除的方式: SET@done=0;WHILE@done=0DODELETEFROMusersWHEREage>30LIMIT1000;SET@done=ROW_COUNT();ENDWHILE; ...
row in set (0.00 sec) #查看相关状态呢变量 mysql> select * from information_schema.session_status where variable_name in('Last_query_cost','Handler_read_next','Innodb_pages_read','Innodb_data_reads','Innodb_pages_read'); +---+---+ | VARIABLE_NAME | VARIABLE_VALUE | +---+--...
DELETE FROM table_nameWHERE conditionORDER BY colm1, colm2, …LIMIT row_count;以下查询首先根据 runoon_title 的字母顺序对数据进行排序,然后从表中删除前三条记录: mysql> DELETE FROM runoon_tbl ORDER BY runoon_title LIMIT 3; JOIN 子句JOIN 子句用...
表中id主键,key1是二级索引,col是普通列。我们前面说过每个表都有一个唯一的table id,在information_Shcema中的innodb_sys_tables。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 mysql>SELECT*FROMinformation_schema.innodb_sys_tablesWHEREname='utf_8/undo_demo';+---+---+---+---+---+---+...