简述
SQLite AUTOINCREMENT是用于自动增加表中字段值的关键字。我们可以通过使用自动增加字段值AUTOINCREMENT 创建具有特定列名的表以自动递增时的关键字。 关键字 AUTOINCREMENT 只能与 INTEGER 字段一起使用。句法
的基本用法 AUTOINCREMENT 关键字如下 -CREATE TABLE table_name( column1 INTEGER AUTOINCREMENT, column2 datatype, column3 datatype, ..... columnN datatype,); 例子
考虑按如下方式创建 COMPANY 表 - sqlite> CREATE TABLE COMPANY( ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR(50), SALARY REAL); 现在，将以下记录插入表 COMPANY - INSERT INTO COMPANY (NAME,AGE,ADDRESS,SALARY)VALUES ( 'Paul', 32, 'California', 20000.00 );INSERT INTO COMPANY (NAME,AGE,ADDRESS,SALARY)VALUES ('Allen', 25, 'Texas', 15000.00 );INSERT INTO COMPANY (NAME,AGE,ADDRESS,SALARY)VALUES ('Teddy', 23, 'Norway', 20000.00 );INSERT INTO COMPANY (NAME,AGE,ADDRESS,SALARY)VALUES ( 'Mark', 25, 'Rich-Mond ', 65000.00 );INSERT INTO COMPANY (NAME,AGE,ADDRESS,SALARY)VALUES ( 'David', 27, 'Texas', 85000.00 );INSERT INTO COMPANY (NAME,AGE,ADDRESS,SALARY)VALUES ( 'Kim', 22, 'South-Hall', 45000.00 );INSERT INTO COMPANY (NAME,AGE,ADDRESS,SALARY)VALUES ( 'James', 24, 'Houston', 10000.00 ); 这将在表 COMPANY 中插入 7 个元组，COMPANY 将具有以下记录 - ID NAME AGE ADDRESS SALARY---------- ---------- ---------- ---------- ----------1 Paul 32 California 20000.02 Allen 25 Texas 15000.03 Teddy 23 Norway 20000.04 Mark 25 Rich-Mond 65000.05 David 27 Texas 85000.06 Kim 22 South-Hall 45000.07 James 24 Houston 10000.0
