https://www.linjiangxiong.com/2019/10/12/mysql-auto-increment-id/ 1. 2. link 总结 1.违反唯一键约束,事务回滚和批量插入数据,会造成数据自增主键不连续的情况。 2.在生产上,尤其是有 insert … select ;replace … select 和 load data语句这种批量插入数据的场景时,从并发插入数据性能的角度考虑, 我...
Suppose you have a table with non-numeric fields and you want to add auto-increment column with a prefix (such as 'ccs1'). This is how you will do it. For ease of understanding, I'm creating the table also. create table demo(id varchar(10),nme varchar(10)); You then need ...
ALTER TABLE 创建好的表名称 MODIFY COLUMN 创建好的表需要修改的字段 INT AUTO_INCREMENT 全文:https://zhidao.baidu.com/question/359185899.html 9) 修改字段属性 mysql修改已存在的表增加ID属性为auto_increment自动增长 今天有需要将已经存在表设置自动增长属性 具体如下 alter table customers change id id int...
sql_table.cc::mysql_alter_table(); //判断当前操作是否可以进行Inplace实现,不可进行Inplace Alter的包括: // 1. Auto Increment字段修改; // 2.列重命名; // 3.行存储格式修改;等 mysql_compare_tables() -> ha_innobase::check_if_incompatible_data(); // Inplace创建索引第一阶段(主要阶段) han...
Description: There is a bug during migration from MS SQL to MySQL. There is no Auto Increment in PK column in target table. I guess it happens during preparation of CREATE statements (examples below). Checked with Workbench for Windows 10: versions with BUG: 8.0.14 / 8.0.15 / 8.0.16 ...
CREATETABLEemployees(idINTAUTO_INCREMENTPRIMARYKEY,nameVARCHAR(100)NOTNULL,statusENUM('active','inactive')DEFAULT'active'); 1. 2. 3. 4. 5. 解释:在这个示例中,我们创建了一个employees表,其中id是主键,name是员工的名字,类型为字符串,不允许为空。而status字段为枚举类型,其默认值为'active'。
Postgresql的Liquibase addAutoIncrement错误 PostgreSQL是一种开源的关系型数据库管理系统,Liquibase是一个用于数据库版本控制和迁移的工具。在使用Liquibase的addAutoIncrement功能时,可能会遇到一些错误。 错误可能有多种原因,下面是一些常见的错误和解决方法: 错误:addAutoIncrement无效或不起作用。解决方法:确保在正确的位...
Bug #16993 ALTER TABLE ADD id INT AUTO_INCREMENT is not replicated correctly Submitted: 1 Feb 2006 3:49Modified: 20 Apr 2006 12:07 Reporter: Jonathan Miller Email Updates: Status: Closed Impact on me: None Category: MySQL Server: DocumentationSeverity: S2 (Serious) Version: 5.1.6-alpha...
mysql> use mydb;mysql> CREATE TABLE mytable (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, name VARCHAR(50), age INT) ENGINE=TokuDB;mysql> quit;4. 测试TokuDB存储引擎：mysql -u root -p mysql> use mydb;mysql> INSERT INTO mytable (name, age) VALUES (‘John Doe&#...
After work, I find a solution, I used a variable with an himself autoincrement and I concat it with an other field. The code is : SET @RowNum=0; SELECT @RowNum:=@RowNum + 1, CONCAT_WS('_', T_Cmde_BaseNumCle2, Convert(@RowNum, Char(7))) from t_jp_commande; ...