alter table user_seminar add us_id Int NOT NULL AUTO_INCREMENT; this gives me following error: "incorrect table definition; there can be only one auto column and it must be defined as a key" what I tried first: alter table user_seminar drop primary key; ...
在修改AUTO_INCREMENT值之前,通常需要先查看当前值。可以使用如下 SQL 语句: SELECTAUTO_INCREMENTFROMinformation_schema.tablesWHEREtable_name='your_table_name'ANDtable_schema='your_database_name'; 1. 2. 修改 AUTO_INCREMENT 值 如果你想要更改某个表的AUTO_INCREMENT值,可以使用以下 SQL 语句: ALTERTABLEyou...
更改mysql数据库主键自增时报错ALTER TABLE causes auto_increment resequencing, resulting in duplicate entry '1' 主要步骤: 1、将主键字段值为0的那条记录值改为其他大于0且不重复的任意数 2、修改主键字段为auto_increment 3、把刚才修改过的那条记录的值还原 CREATETABLE`table_test_bak` ( `oc_sys_dict_...
The exception is for “mixed-mode inserts”, where the user provides explicit values for an AUTO_INCREMENT column for some, but not all,(部分AUTO_INCREMENT值明确了,部分没有明确) rows in a multiple-row “simple insert”. For such inserts, InnoDB allocates more auto-increment values than the...
CREATE TABLE [IF NOT EXISTS] table_name ( column_name1 date_type, column_name2 date_type, ... ) [ENGINE=表引擎 [DEFAULT] CHARSET=utf8] 1. 2. 3. 4. 5. 示例: -- 创建学生表 CREATE TABLE IF NOT EXISTS `student`( `id` BIGINT UNSIGNED AUTO_INCREMENT COMMENT '自增主键key,【表必...
ALTER TABLE APPUSER MODIFY APPUSERID int(11) unsigned AUTO_INCREMENT, AUTO_INCREMENT=1000; Mysql version is 4.0.23 Thanks. Subject Views Written By Posted Adding AUTO_INCREMENT to existing column 11475 Rostislav Khaskin March 16, 2005 12:29PM ...
idINTNOTNULLAUTO_INCREMENT, usernameVARCHAR(50)NOTNULL, ageINT, PRIMARYKEY(id) ); 有效的插入 1 INSERTINTOusers(username,age)VALUES('zhangsan',30); 无效的插入 1 INSERTINTOusers(username,age)VALUES('lisi','five'); 报错ERROR 1366 (HY000): Incorrect integer value: 'five' for column 'age' ...
How to Make Existing Column AUTO_INCREMENT in MySQL If you have a table and you want to set an auto-increment to existing column you can execute the following SQL statement: ALTER TABLE user CHANGE COLUMN id id INT AUTO_INCREMENT;
If you are inserting a row into a table with an auto increment primary key, you can retrieve the insert id like this: connection.query('INSERT INTO posts SET ?', {title: 'test'}, function (error, results, fields) { if (error) throw error; console.log(results.insertId); }); When...
If you create the auto increment column first, then it will use whatever the current value of auto_increment is, and any rows that get created before you can "alter table" won't be correct. Thus, you MUST set auto_increment before you add an auto increment column....