Question

我正在为新公司开发应用程序管理业务（销售，供应商，客户，产品......）。首先，我需要创建一个数据库。你能否告诉我BD方案是否良好且优化？

CREATE TABLE IF NOT EXISTS `company` (
  id UNSIGNED INT NOT NULL auto_increment,
  `SIRET` varchar(50) NOT NULL,
  `nom` varchar(50) NOT NULL,
  `description` varchar(500) NOT NULL,
  `enable` ENUM('YES', 'NO') DEFAULT 'YES',
  `level` int(1) NOT NULL,
  PRIMARY KEY  (id),
  UNIQUE KEY SIRET (SIRET)
) ENGINE=INNODB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

// contactType can be one of the 3 values : email, phone, fax
CREATE TABLE IF NOT EXISTS `contactType` (
  id UNSIGNED INT NOT NULL auto_increment,
  `contactType` ENUM('email', 'phonenumber', 'faxnumber')
  `mobile` ENUM('YES', 'NO') default 'NO',
  PRIMARY KEY  (id),
  UNIQUE KEY type (contactType)
) ENGINE=INNODB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `contacts` (
  id UNSIGNED INT NOT NULL auto_increment,
  `SIRET` varchar(50) NOT NULL,
  `contactType` varchar(50) NOT NULL, // A reference to contactType just above
  `contactref` varchar(50) NOT NULL, // Phone number, fax number or email adress
  PRIMARY KEY  (id),
  UNIQUE KEY type (SIRET)
) ENGINE=INNODB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `customers` (
  id UNSIGNED INT NOT NULL auto_increment,
  `SIRET` varchar(50) NOT NULL,
  PRIMARY KEY  (id),
  UNIQUE KEY type (SIRET)
) ENGINE=INNODB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `supplier` (
  id UNSIGNED INT NOT NULL auto_increment,
  `SIRET` varchar(50) NOT NULL,
  PRIMARY KEY  (id),
  UNIQUE KEY type (SIRET)
) ENGINE=INNODB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `industry` (
  id UNSIGNED INT NOT NULL auto_increment,
  `industry` varchar(250) NOT NULL,
  PRIMARY KEY  (id),
  UNIQUE KEY type (activite)
) ENGINE=INNODB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `entreprisePerIndustry` (
  id UNSIGNED INT NOT NULL auto_increment,
  `industry_id` varchar(250) NOT NULL, // Chemical, Computer, Consulting, ...
  FOREIGN KEY (industry_id) REFERENCES industry(id) ON DELETE CASCADE,
  `SIRET` varchar(50) NOT NULL,
  PRIMARY KEY  (id),
  UNIQUE KEY type (industry_id)
) ENGINE=INNODB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

Answer 1

以下是 TIPS ，它可以帮助您创建更好的数据库

如果要使外键约束起作用，请将表引擎从MyISAM更改为InnoDB。
自动增量 DataType应为 UNSIGNED INT 。这将使范围加倍。
```
`id` INT UNSIGNED NOT NULL AUTO_INCREMENT`
```
如果从允许值列表中选择的列值，则将dataType更改为ENUM。在您的案例enable中，level可以转换为 ENUM < / strong> dataType

`enable` ENUM( 'y', 'n' ) NOT NULL DEFAULT 'y' COMMENT 'y:yes; n:no' `

添加foreign key relation to

contacts。contactType与contactType。id

entreprisePerIndustry。industry与industry。id

更新

我创建了基本和优化的表结构（AFAIK）。

-- -- Table structure for table `tbl_company` -- CREATE TABLE IF NOT EXISTS `tbl_company` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `siret` varchar(50) NOT NULL, `nom` int(11) NOT NULL, `description` varchar(250) NOT NULL, `enable` enum('y','n') NOT NULL DEFAULT 'y' COMMENT 'y:yes; n:no', `level` enum('1','2') NOT NULL DEFAULT '1', `last_updated_on` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ; -- -- Table structure for table `tbl_contact` -- CREATE TABLE IF NOT EXISTS `tbl_contact` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `siret` varchar(50) NOT NULL, `contact_type` enum('email','phone','fax') NOT NULL DEFAULT 'email', `contact_ref` varchar(100) NOT NULL COMMENT 'Phone number, fax number or email adress', `last_updated_on` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`), UNIQUE KEY `siret` (`siret`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ; ... ...

complate structure is here

数据库结构：好还是不好？

1 个答案:

更新