1.INSERT INTO SELECT insert into Table2(field1,field2,...) select value1,value2,... from Table1 注意 (1)要求目标表Table2必须存在,并且字段field,field2…也必须存在 (2)注意Table2的主键约束,如果Table2有主键而且不为空,则 field1, field2…中必须包括主键 在执行语句的时候,MySQL是逐行加锁的...
--1、开启一个事务(root@localhost)[test]>begin;QueryOK,0rowsaffected(0.00sec)(root@localhost)[test]>insert intot1(c2)values('aa');QueryOK,1rowaffected(0.00sec)(root@localhost)[test]>select*from t1;+---+---+|c1|c2|+---+---+|1|aa|+---+---+1rowinset(0.00sec)(root@localhost)...
1.INSERT INTO SELECT 代码语言:javascript 代码运行次数:0 运行 AI代码解释 insert intoTable2(field1,field2,...)select value1,value2,...from Table1 注意 (1)要求目标表Table2必须存在,并且字段field,field2…也必须存在 (2)注意Table2的主键约束,如果Table2有主键而且不为空,则 field1, field2…中必...
) ENGINE=InnoDB AUTO_INCREMENT=2DEFAULTCHARSET=utf81rowinset(0.00sec)--3、再次开启事务,插入值并提交(root@localhost) [test]>begin; Query OK,0rowsaffected (0.00sec) (root@localhost) [test]>insertintot1(c2)values('aaa'); Query OK,1rowaffected (0.02sec) (root@localhost) [test]>select*from...
1、关键字:auto_increment 2、特点: (1)一个表只能有一个自增列 (2)自增列必须是整型的 (3)自增列必须是键列,例如:主键,唯一键 3、如何指定自增 create table emp( eidintprimary key auto_increment, ename varchar(20) not null ); insert into emp values(2,'张三'); ...
title Adding Data to MySQL Table with Auto-Increment Field section Create Table MySQL->>MySQL: CREATE TABLE users (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(50)); section Insert Data MySQL->>MySQL: INSERT INTO users (name) VALUES ('Alice'); ...
SELECT列名1,列名2,...,DEFAULT_FIELDFROM表名; 1. 2. 其中,DEFAULT_FIELD表示要添加到查询结果中的默认字段,可以是一个常量值、一个表达式,或者一个函数。 默认添加一个常量字段的例子 让我们通过一个例子来演示如何在查询结果中默认添加一个常量字段。
Hello all, i have a table in which i have started the auto increment id at 10000 so that i have 10000 values reserved for manual insertion of values from admins. However when doing an insert into MyTable(ID,Name,Value) VALUES(500,"Test","Test") i do a select and it ignored my ID...
在MySQL中,主键约束(PRIMARY KEY)用于确保表中每一行的唯一性。主键可以是单个列或多个列的组合,这些列的值组合在表中必须是唯一的,并且不允许包含NULL值。每个表只能有一个主键,通常主键列会有自动增长(AUTO_INCREMENT)属性,以便自动为新行生成唯一的序列号。
I think something might be wrong with the tabe, but I don't know how to fix it. I have one auto_increment field on the table, and my insert statement keeps failing. Updates and selects works perfectly well, but not inserts. I'm not sure what to do to fix it. ...