The primary industry refers to agriculture, forestry, animal husbandry and fishery.
The secondary industry refers to mining, manufacturing, production and supply of electricity, gas and water, and construction.
The tertiary industry refers to other industries except the primary and secondary industries. The tertiary industry includes transportation, warehousing and postal services, information transmission, computer services and software, wholesale and retail, accommodation and catering, finance, real estate, leasing and business services, scientific research, technical services and geological exploration, water conservancy, environment and public facilities management, residential services and other services, education, health, social security and social welfare, culture, sports and entertainment, public management and welfare.
From the above classification, the sales industry belongs to the tertiary industry, and the bookstore belongs to the sales category, which naturally belongs to the tertiary industry.