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MySQL 8.0 Reference Manual  /  Restrictions and Limits  /  Restrictions on Character Sets

C.7 Restrictions on Character Sets

  • Identifiers are stored in mysql database tables (user, db, and so forth) using utf8, but identifiers can contain only characters in the Basic Multilingual Plane (BMP). Supplementary characters are not permitted in identifiers.

  • The ucs2, utf16, utf16le, and utf32 character sets have the following restrictions:

  • The REGEXP and RLIKE operators work in byte-wise fashion, so they are not multibyte safe and may produce unexpected results with multibyte character sets. In addition, these operators compare characters by their byte values and accented characters may not compare as equal even if a given collation treats them as equal.


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