SELECT DISTINCT tea.id "teacherId",tea.name "teacherName", lower(case when tea.NAME REGEXP '^[a-zA-Z]' then LEFT(tea.NAME , 1) when tea.NAME REGEXP '^[0-9]' then LEFT(tea.NAME , 1) else ELT(INTERVAL(CONV(HEX(LEFT(CONVERT(tea.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') end) region FROM zhkt_teacher tea WHERE order by region asc, teacherName asc
