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numbering scheme : ウィキペディア英語版 | numbering scheme
There are many different numbering schemes for assigning nominal numbers to entities. These generally require an agreed set of rules, or a central coordinator. The schemes can be considered to be examples of a primary key of a database management system table, whose table definitions require a database design. Numbering schemes include: ==Chemistry==
*CAS registry numbers for chemical compounds *EC numbers for identifying enzymes *UN numbers for (classes of) hazardous substances *E numbers for food additives
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