The document is a presentation in Japanese about character sets and collations in MySQL. It discusses how MySQL treats emoji characters like sushi and beer the same by default, but PostgreSQL does not. It explains that MySQL has both a character set (which defines how characters are encoded as bytes) and collation (which defines the sorting rules). For the UTF-8 character set, it shows the different collation options and how they treat letters, emojis, hiragana/katakana, and case sensitivity differently. It expresses a need for a Japanese-specific collation that properly distinguishes Japanese characters.
The document is a presentation in Japanese about character sets and collations in MySQL. It discusses how MySQL treats emoji characters like sushi and beer the same by default, but PostgreSQL does not. It explains that MySQL has both a character set (which defines how characters are encoded as bytes) and collation (which defines the sorting rules). For the UTF-8 character set, it shows the different collation options and how they treat letters, emojis, hiragana/katakana, and case sensitivity differently. It expresses a need for a Japanese-specific collation that properly distinguishes Japanese characters.