重複しない識別子 - .｡oO(さっちゃんですよヾ(〃l

重複しない識別子

UUID (universally unique identifier)

RFC 4122 A Universally Unique IDentifier (UUID) URN Namespace

RFC 9562 Universally Unique IDentifiers (UUIDs)

variant 1

variant 2

v1 の互換な改良。v7 を推奬する

$ <<epoch_ms:48,7:4,random1:12,2:2,random2:62>>

GUID (globally unique identifier)

ULID (universally unique lexicographically sortable identifier)

Nano ID

sid (sortable identifier)

SHA256 等の hash 函數を使ふ

snowflake

MySQL の auto increment。PostgreSQLPostgreSQL.iconの sequence

URL (uniform resource locator)

URI (uniform resource identifier)

URN (uniform resource name)

IP address

IPv4

IPv6

MAC address (medium access control address)

OID (object identifier)

DOI (digital object identifier)

ISBN (international standard book number。國際標準圖書番號)

ISSN (international standard serial number。國際標準逐次刊行物番號)