sql中应该如何实现表中两列数据相除？

WITH nl_sentcount
AS(
       Select nl_id, count(distinct user_id) as sent_num from sheet1$ Where event_type='nlsent' group by nl_id
)
, nl_opencount AS (
  SELECT nl_id, count(distinct user_id) as open_num from Sheet1$ where event_type = 'nlpv' group by nl_id
)
select a.nl_id, sent_num, open_num
from nl_sentcount a
inner join nl_opencount b
on a.nl_id = b.nl_id

目前我有上述一段代码，然后结果是这样的

我想问一下如果我想在这个表里在加一列open rate (open_num/sent_num) ，应该怎么修改代码？

WITH nl_sentcount
AS(
       Select nl_id, count(distinct user_id) as sent_num from sheet1$ Where event_type='nlsent' group by nl_id
)
, nl_opencount AS (
  SELECT nl_id, count(distinct user_id) as open_num from Sheet1$ where event_type = 'nlpv' group by nl_id
)
select a.nl_id, sent_num, open_num,
        open_num / sent_num as open_rate
from nl_sentcount a
inner join nl_opencount b
on a.nl_id = b.nl_id

WITH nl_sentcount AS( Select nl_id, count(distinct user_id) as sent_num from sheet1$ Where event_type='nlsent' group by nl_id ) , nl_opencount AS ( SELECT nl_id, count(distinct user_id) as open_num from Sheet1$ where event_type = 'nlpv' group by nl_id )open_num select a.nl_id, sent_num, open_num,open_num/sent_num num_Rate from nl_sentcount a inner join nl_opencount b on a.nl_id = b.nl_id

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