If you are using Unicode for Japanese, keep in mind that the Japanese_ and Japanese_Unicode_ collations do not support supplementary characters correctly, but instead interpret them as replacement characters. However, the following Japanese collations recognize supplementary characters correctly:
- Japanese_90_CI_AS
- Japanese_Bushu_Kakusu_100_ CI_AS
- Japanese_XJIS_100_ CI_AS
When modifying the COLLATE property, ensure that you use a Japanese collation that supports supplementary characters.