CREATETABLEusers(idINTAUTO_INCREMENTPRIMARYKEY,nameVARCHAR(50),ageINT); 1. 2. 3. 4. 5. 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...
SQL Server 代码语言:txt 复制 CREATE TABLE users ( id INT IDENTITY(1,1) PRIMARY KEY, name VARCHAR(255) NOT NULL ); INSERT INTO users (name) VALUES ('Alice'); Oracle 代码语言:txt 复制 CREATE SEQUENCE user_seq START WITH 1 INCREMENT BY 1; CREATE TABLE users ( id NUMBER PRIMARY KEY, ...
-- insert a row in the Customers tableINSERTINTOCustomers(customer_id, first_name, last_name, age, country)VALUES(7,'Ron','Weasley',31,'UK'); Here, the SQL command inserts a new row into theCustomerstable with the given values. INSERT INTO Syntax INSERTINTOtable_name(column1, column2,...
REPLACE INTO customer(id,NAME,phone) VALUES(2,"小五","17610111115") 1. 结论:replace into 的数据中如果比原数据少字段,则该字段更新时恢复为默认值(此处默认为NULL)。故可以确定replace into 删除已存在记录时,很彻底,没有做备份,之后直接新增replace into 后面确定的数据,没有值的字段设为默认值。 注:这...
连续模式:可以事先确定插入行数的语句(包括单行和多行插入),分配连续的确定的auto-increment值;对于插入行数不确定的插入语句,仍加表锁。这种模式下,事务回滚,auto-increment值不会回滚,换句话说,自增列内容会不连续。 交错模式:同一时刻多条SQL语句产生交错的auto-increment值。
id int(3) NOT NULL AUTO_INCREMENT, username varchar(20) NOT NULL, password varchar(20) NOT NULL, PRIMARY KEY (id) ); c. 添加部分数据 : INSERT INTO users (id, username, password) VALUES (1, 'r00tgrok', 'ohmygod_is_r00tgrok'); ...
`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-120-sz'),(35,'abc-...
The CustomerID column is an auto-increment field and will be generated automatically when a new record is inserted into the table.Insert Data Only in Specified ColumnsIt is also possible to only insert data in specific columns.The following SQL statement will insert a new record, but only ...
I'm having a problem with using AUTO_INCREMENT / LAST_INSERT_ID within a cursor. Specifically, as I loop through my cursor, I insert a row into the table with the auto increment feature. I then get the last insert id, and I use that to update a different table. However, every time...
首先我们创建一个数据库 test,然后创建一个测试表 t,主键为 id,并插入测试数据: > usetest;``> create table t(id int NOT NULL AUTO_INCREMENT , PRIMARY KEY (id));``> insert into t(id) values(1),(10),(20),(50); 然后我们开两个客户端会话...