新零售电商数据库设计（1）品牌和分类关系

CREATE TABLE t_brand(
    id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT COMMENT ‘主键‘,
    `name` VARCHAR(200) NOT NULL COMMENT ‘名称‘,
    image VARCHAR(500) COMMENT ‘图片网址‘,
    letter CHAR(1) NOT NULL COMMENT ‘品牌首字母‘,
　　`is_deleted` tinyint(1) NOT NULL DEFAULT 0 COMMENT ‘逻辑删除‘,
    UNIQUE unq_name(`name`),
    INDEX idx_letter(letter)
    ) COMMENT=‘品牌表‘;

CREATE TABLE t_category(
    id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT COMMENT ‘主键‘,
    `name` VARCHAR(200) NOT NULL COMMENT ‘分类名称‘,
  parent_id INT UNSIGNED COMMENT ‘上级分类ID‘,
    if_parent BOOLEAN NOT NULL COMMENT ‘是否含有下级分类‘,
    sort INT UNSIGNED NOT NULL COMMENT ‘排名指数‘,
`is_deleted` tinyint(1) NOT NULL DEFAULT 0 COMMENT ‘逻辑删除‘,
    INDEX idx_parent_id(parent_id),
    INDEX idx_sort(sort)
    ) COMMENT =‘商品分类表‘;

CREATE TABLE t_category_brand(
    category_id INT UNSIGNED COMMENT ‘分类ID‘,
    brand_id INT UNSIGNED COMMENT ‘品牌ID‘,
`is_deleted` tinyint(1) NOT NULL DEFAULT 0 COMMENT ‘逻辑删除‘,
    PRIMARY KEY(category_id,brand_id)
    ) COMMENT=‘分类与品牌关联表‘