mysql 根据中英文首字母检索

SELECT dish_id id,name
      FROM dish_name_language
      WHERE language_id = ?LanguageId
      AND ((ELT( INTERVAL( CONV( HEX( left( CONVERT( name
      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' ) BETWEEN ?FromLetter AND ?ToLetter)
      OR (LEFT(name,1) BETWEEN ?FromLetter AND ?ToLetter))
      ORDER BY name ASC;