【MySQL】Error Code: 1093. You can‘t specify target table ‘xxx‘ for update in FROM clause,程序员大本营,技术文章内容聚合第一站。
-- 1.复制id=0的数据到临时表, CREATE TABLE TEMP_TABLE AS SELECT * FROM MY_TABLE WHERE id = 0; -- 2.删除源表中id=0的记录 DELETE FROM MY_TABLE WHERE id = 0; -- 3.重建索引 ALTER TABLE MY_TABLE ADD INDEX ...; -- 4.导回id=0的新数据 INSERT IGNORE INTO MY_TABLE SELECT * FR...
-- 准备测试表 create table for_delete(id int primary key auto_increment, name varchar(20)); -- 插入测试数据 INSERT INTO for_delete (name) VALUES ('A'), ('B'), ('C'); -- 查询表数据 select * from for_delete; +---+---+ | id | name | +---+---+ | 1 | A | | 2 ...
报错2:Error Code: 1442. Can't update table 'student' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. 原因:存储的函数或触发器不能修改已被调用该函数或触发器的语句(用于读取或写入)使用的表。 解决办法:student表上的触发器里 不能再更...
最近遇到一个案例,很多查询被阻塞没有返回结果,使用show processlist查看,发现不少MySQL线程处于Waiting for table flush状态,查询语句一直被阻塞,只能通过Kill进程来解决。那么我们先来看看Waiting for table flush的官方解释:https://dev.mysql.com/doc/refman/5.6/en/general-thread-states.html ...
Table columns, indexes, foreign keys, and triggers You can perform the following actions for each connection: Click the Connect icon (>) to make a connection, open DB Notebook, and execute the \about command. Click the Reload icon to reload database information. Right...
Mysql通过CodeFirst方式使用EF 1、MySql环境准备 (1)ADO.NET driver 安装ADO.NET操作MySql的驱动“Connector/NET”,下载地址如下: https://dev.mysql.com/downloads/connector/net/8.0.html (2)VS访问MySql对象的支持(包括Entity Framework) A、通过安装“MySQL for Visual Studio”以支持访问MySql对象及VS的设计器...
zero-acTable是基于实体类创建表的开源项目。您只需要在实体类上标记相关注解就能达到创建数据库的操作,指定初始化脚本就能执行数据初始化,内置测试demo。 数据库支持 mysql、达梦 功能介绍 兼容MP 排除字段逻辑(static、transient修饰字段和@TableField注解exist=false) 兼容MP @TableField、@TableName,@TableId注解 兼...
createtablet01(idint,codevarchar(10),start_date datetime,titlevarchar(10),contentvarchar(30),classint,end_date datetime); 插入一些数据, bisal@mysqldb: [test]> select * from t01;+---+---+---+---+---+---+---+| id |code| start_date |tit...
tables, time zone information, etc. Dictionary (DD) tables: The system tables that are used for storing meta data about database items. E.g., the table 'mysql.tables' is a dictionary table, while the help tables are not. DDSE tables: System tables that are created by the server on ...