SQL获取字段字符串中文首字母

有中文有英文，获取中文首字母信息。

SELECT person_name_cn ,

ELT(INTERVAL(CONV(HEX(LEFT(CONVERT(person_name_cn USING gbk),1)),16,10),

0xB0A1,0xB0C5,0xB2C1,0xB4EE,0xB6EA,0xB7A2,0xB8C1,0xB9FE,0xBBF7,

0xBFA6,0xC0AC,0xC2E8,0xC4C3,0xC5B6,0xC5BE,0xC6DA,0xC8BB,0xC8F6,

0xCBFA,0xCDDA,0xCEF4,0xD1B9,0xD4D1),

'A','B','C','D','E','F','G','H','J','K','L','M','N','O','P',

'Q','R','S','T','W','X','Y','Z') AS PY 

FROM person WHERE LEFT(person_name_cn,1) NOT IN ('A','B','C','D','E','F','G','H','J','K','L','M','N','O','P',

'Q','R','S','T','W','X','Y','Z')