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MySQL 5.7 Reference Manual  /  ...  /  Collation Naming Conventions

11.1.3 Collation Naming Conventions

MySQL collation names follow these conventions:

  • A collation name starts with the name of the character set with which it is associated, followed by one or more suffixes indicating other collation characteristics. For example, utf8_general_ci and latin_swedish_ci are collations for the utf8 and latin1 character sets, respectively.

  • A language-specific collation includes a language name. For example, utf8_turkish_ci and utf8_hungarian_ci sort characters for the utf8 character set using the rules of Turkish and Hungarian, respectively.

  • Case sensitivity for sorting is indicated by _ci (case insensitive), _cs (case sensitive), or _bin (binary; character comparisons are based on character binary code values). For example, latin1_general_ci is case insensitive, latin1_general_cs is case sensitive, and latin1_bin uses binary code values.

  • For Unicode, collation names may include a version number to indicate the version of the Unicode Collation Algorithm (UCA) on which the collation is based. UCA-based collations without a version number in the name use the version-4.0.0 UCA weight keys. For example:

  • For Unicode, the xxx_general_mysql500_ci collations preserve the pre-5.1.24 ordering of the original xxx_general_ci collations and permit upgrades for tables created before MySQL 5.1.24. For more information, see Section 2.11.3, “Checking Whether Tables or Indexes Must Be Rebuilt”, and Section 2.11.4, “Rebuilding or Repairing Tables or Indexes”.


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