問(wèn)題描述

mysql建表報(bào)錯(cuò)，查手冊(cè)看不懂，求解？

create table abc( id int unsigned primary_key auto_increment, usename char(20) not null default ’’, gender char(1) not null default ’’, weight tinyint unsigned not null default 0, birth date not null default 0, salary decimal(8,2) not null default ’000000.00’, lastlogin timestamp not null default 0, intro varchar(1500) not null default ’’,)engine myisam charset=utf8;

報(bào)錯(cuò)：you have an error in your sql syntax;check the manual that corresponds to your MySQL server version for the right syntax to use near ’primary_key auto_increment,username char(20) not null default ’’,gender c’ at line 3

問(wèn)題解答

創(chuàng)建帶索引的數(shù)據(jù)庫(kù)表需要為表名和屬性添加反單引號(hào)，并且你當(dāng)前的primary key的位置需要調(diào)整一下：

create table `abc`( `id` int unsigned auto_increment, `usename` char(20) not null default ’’, `gender` char(1) not null default ’’, `weight` tinyint unsigned not null default 0, `birth` date not null default 0, `salary` decimal(8,2) not null default ’000000.00’, `lastlogin` timestamp not null default 0, `intro` varchar(1500) not null default ’’, primary key (`id`))engine myisam charset=utf8;

我剛剛試了一下，除了primary key其他的屬性和表名不加反單引號(hào)也可以，即這樣也是可以的：

create table abc( id int unsigned auto_increment, usename char(20) not null default ’’, gender char(1) not null default ’’, weight tinyint unsigned not null default 0, birth date not null default 0, salary decimal(8,2) not null default ’000000.00’, lastlogin timestamp not null default 0, intro varchar(1500) not null default ’’, primary key (`id`))engine myisam charset=utf8;

參考：mysql創(chuàng)建和刪除表

primary_key聲明的不對(duì)，樓上解