这段代码使用CREATE TABLE语句创建了一个名为"users"的表。其中,id字段使用了AUTO_INCREMENT关键字,表示该字段是自增的。PRIMARY KEY关键字指定了id字段为主键。 2.2 编写INSERT INTO语句 在插入数据之前,我们需要编写INSERT INTO语句。下面是一个示例的INSERT INTO语句,用于向"users"表中插入一条数据: INSERTINTOuse...
在这种模式下,上面提到的三种insert语句,针对 AUTO_INCREMENT columns,都需要获取table-level AUTO-INC lock。这种锁的生命期如下:This lock is normally held to the end of the statement (not to the end of the transaction) to ensure that auto-increment values are assigned in a predictable and repeatabl...
我们可以再次通过命令 show create table t4 \G;来验证一下。 此时我们可以找到AUTO_INCREMENT这个属性,并且它的值等于4,这个是不是就是说明AUTO_INCREMENT记录的值表示对于下一条记录的id值。 通过delete table t4; 来把t4里面的记录清空。 然后再调用show create table t4 \G;命令 可以发现表的信息并没有因为...
I keep getting an error whenever I try to Insert a new record with an auto_increment field. When I do the Insert inside the Query Browser and leave out the auto field, it works fine. If I try to do that with VB.Net 2.0 ASP, it gives me a 23000 error. The table has a field ...
auto_increment:每插入一条数据,客户表(customers)的主键id就自动增1,如下所示 1createtablecustomers-- 创建客户表2(3idintauto_incrementprimarykeynotnull,-- auto_increment:自增长4namevarchar(15)5);6 1.2、测试(实例) 1insertintocustomers(name)values("张三"),("李四");--向客户表中插入数据23select...
mysql> set session auto_increment_increment=0; 1. Query OK, 0 rows affected, 1 warning (0.01 sec) 1. 1. mysql> show variables like 'auto_increment%'; 1. +---+---+ 1. | Variable_name | Value | 1. +---+---+ 1. | auto_increment_...
CREATE TABLE `t` ( `id` int(11) NOT NULL AUTO_INCREMENT, `cnt` varchar(32) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `unq_cnt` (`cnt`) ) ENGINE=InnoDB; insert into t values(10,'abc-100-sz'),(15,'abc-105-sz'),(20,'abc-110-sz'),(25,'abc-115-sz'),(30,'abc-12...
obclient[oboracle]>CREATETABLEtest(->IDNUMBERNOTNULLPRIMARYKEY,->NAMEVARCHAR2(480),->AGENUMBER(10,0)->);QueryOK,0rowsaffected(0.116sec)obclient[oboracle]>CREATESEQUENCEseq_testSTARTWITH100INCREMENTBY1;QueryOK,0rowsaffected(0.026sec)obclient[oboracle]>INSERTINTOtest(ID,NAME,AGE)VALUES(seq_test...
5.6.9 Using AUTO_INCREMENT TheAUTO_INCREMENTattribute can be used to generate a unique identity for new rows: CREATETABLEanimals(idMEDIUMINTNOTNULLAUTO_INCREMENT,nameCHAR(30)NOTNULL,PRIMARYKEY(id));INSERTINTOanimals(name)VALUES('dog'),('cat'),('penguin'),('lax'),('whale'),('ostrich');...
LAST_INSERT_ID, it gives me the value used for the first insert (of the loop) into my auto increment table. So if I insert five rows into my table with the auto increment (separate inserts), and I call last_insert_id after each one, I get the value used by the first insert each...