Duplicate entry '1' for key 'test_key.PRIMARY' 有了主键可以准确性的对数据进行增删查改 代码语言:javascript 代码运行:0 运行 AI代码解释 mysql> select from test_key; +---+---+ | id | name | +---+---+ | 1 | 张飞| | 2 | 刘备| +---+---+ 2 rows in set (0.00 sec) ...
2. CREATE TABLE ... LIKE statement to create an empty table based on the definition of the original table, including column attributes and indexes. By the way, if you need to obtain indexes, refer toHow to Show Indexes in MySQL Tables & Database. CREATE TABLE copy_table LIKE source_tabl...
.登录master,先把master锁表,flsuh tables with read lock;然后show master status;得到最新的File文件值和Position值,然后登录slave,stop slave;重新连接master: change master to master_host='192.168.5.5',master_user='replication',master_password='211212',master_log_file='master-bin.000005',master_log_p...
. 省略部分 ### 说明概述若通过tcp/ip地址连接mysql;它将先检查权限视图表,检测请求方的ip是否允许被连接 mysql> use mysql; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> select host, user...
1.String Data Type Syntax In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. For definitions of character string columns (CHAR, VARCHAR, and the TEXT types), MySQL interprets【ɪnˈtɜːrprəts诠释;说明...
虽然在RR隔离级别默认使用Gap Lock，但用户可以通过以下两种方式来显式地关闭Gap Lock：将事务的隔离级别设置为READ COMMITTED；将参数innodb_locks_unsafe_for_binlog设置为1；当设置了上述参数或隔离级别调整到READ COMMITTED时，除了外键约束和唯一性检查（duplicate key）依然需要Gap Lock，其余情况仅使用Record Lock...
alter database <数据库名> character set utf8; alter table <表名> character set utf8; alter table <表名> modify <字段名> character set utf8; 注意:设置之后记得重启,输入命令:service mysql restart select user();查看当前用户名 select current_user;查看当前用户名 ...
/usr/local/mysql/data/mysqld.local.err 方式2:基于SHOW ENGINE INNODB STATUS命令查看最近发生的死锁日志 输入该命令后,你需要去输出的信息中找到如下关键字 --- LATEST DETECTED DEADLOCK --- 后面的内容即是最近一次发生的死锁的内容 方式3:咨询你的DBA吧! 专业...
将SKU改为主键。 从那里你可以做一个INSERT ... SELECT ... ON DUPLICATE KEY UPDATE查询。 I thought I would post what I eventually used for this. It's probably not the "BEST" way, and dropping the column is completely optional. ALTER TABLE `temp_import` ...
修复在分区表上执行INSERT INTO ON DUPLICATE VALUE命令时报错Can't find record on <table>的问题。 修复在含有自增列的分区表上执行TRUNCATE PARTITION命令时小概率崩溃的问题。 修复在B-tree较高或B-tree数据倾斜的大表上执行并行查询操作时,可能存在的并行分片数目过少,或并发worker数据不均衡的问题。 8.0.2.2...