如果我有這樣一個表作爲 Name Email
Sam [email protected]
Fred [email protected]
Ben Null
Tom Null
,我想指望有多少人沒有電子郵件 ,所以我想 SELECT
Name,
Email,
CASE WHEN Email IS NULL
THEN COUNT(Email) ELSE 0 END AS [
使用間隔我有數據集的以下提取物: basisanddowngradessingledates[1716:1721, ]
# A tibble: 6 x 23
Dates Bank CDS Bond `Swap zero rate` `CDS-bond basis` `Basis change` `Rating agency`
<dttm> <chr> <