新建表 tb_student_course,插入数据并查询,SQL 语句和运行结果如下: mysql>CREATE TABLE `tb_student_course` (-> `id`int(4) NOT NULL AUTO_INCREMENT,-> `name` varchar(25) NOT NULL,->PRIMARY KEY (`id`)->); Query OK,0rows affected (0.04sec) mysql> INSERT INTO tb_student_course(name) ...
将truncate语句逐条复制到mysql命令行中执行，支持一次性复制并执行多条语句。123mysql>truncate TABLE dbname.ZONESERVICE;Query OK, 0 rows affectedmysql> 如此，便成功清空了数据库中名为ZONESERVICE的表。简单易懂，对吧？3.数据库操作比较 3.1.truncate与drop和delete的差异 truncate与drop和delete在数据库操作中...
selectCONCAT('truncate TABLE ',table_schema,'.',TABLE_NAME,';')fromINFORMATION_SCHEMA.TABLESwheretable_schemain('数据库1','数据库2'); AI代码助手复制代码 以名为dbname的数据库为例,执行select语句: mysql>selectCONCAT('truncate TABLE ',table_schema,'.',TABLE_NAME,';')fromINFORMATION_SCHEMA.TAB...
Replication of the mysql System Schema Replication and the Query Optimizer Replication and Partitioning Replication and REPAIR TABLE Replication and Reserved Words Replication and Row Searches Replication and Source or Replica Shutdowns Replica Errors During Replication Replication and Server SQL...
当MySQL 5.7 使用规范配置启动时,从debug-trace过程来看,在row_drop_single_table_tablespace、row_drop_table_from_cache函数执行期间根本没有耗时,所以实施优化方案后,没有效果; 耗时的过程在que_eval_sql: query: PROCEDURE DROP_TABLE_PROC ---> dict_drop_index_tree; ...
在mysql中,如果对表执行truncate操作后,会重新设置auto_increment的值,比如: root@localhost (none)>use abce; Database changed root@localhost abce>create table test(id in
mysql> CREATE TABLE `tb_student_course` ( -> `id` int(4) NOT NULL AUTO_INCREMENT, -> `name` varchar(25) NOT NULL, -> PRIMARY KEY (`id`) -> ); Query OK, 0 rows affected (0.04 sec) mysql> INSERT INTO tb_student_course(name) VALUES ('Java'),('MySQL'),('Python'); ...
mysql>truncatetablestudents3; Query OK,0rowsaffected (0.06sec) mysql>rollback; Query OK,0rowsaffected (0.00sec) mysql>select*fromstudents3;Emptyset(0.00sec) mysql>deletefromstudents; Query OK,5rowsaffected (0.00sec) mysql>select*fromstudents;Emptyset(0.00sec) ...
= 'x';$mysql_database = 'z'; // works not with the 浏览3提问于2016-04-28得票数 0 回答已采纳 1回答 创建cron作业以自动清除缓存 \Drupal::database()->truncate('cache_config')->execute();mysql_query('TRUNCATE TABLE yqxq_cache_container'); mysql_query('TRUNCATE TABLE yqxq_cach 浏览...
| 2 | MySQL | | 3 | Python | +---+---+ 3 rows in set (0.00 sec)使⽤ TRUNCATE 语句清空 tb_student_course 表中的记录，SQL 语句和运⾏结果如下：mysql> TRUNCATE TABLE tb_student_course;Query OK, 0 rows affected (0.04 sec)mysql> SELECT * FROM tb_student_course;Empty se...