select reverse(substring(reverse(ORDERNO),1,charindex('_',reverse(ORDERNO)) -1)) from GS_O_ORDERTICKET where TICKETCOUNT<0
select reverse(substring(reverse(ORDERNO),charindex('_',reverse(ORDERNO)) +1,500)) from GS_O_ORDERTICKET where TICKETCOUNT<0
GS_O_ORDERTICKET 表
ORDERNO 字段
'_' 指定字符