SQL - 如何計算一列中多次出現的值

Question

我有一個具有StatusID列的表，該列具有許多不同的可能值，我想要做的是生成以下格式的報告，該報告能夠生成各種條件的計數。

期望的輸出：

Notes | Total | Valid | Invalid | Consults Booked |

Total是返回的所有行的計數 - 已在下面的查詢中

有效是任何StatusID不是5 ， 7或42

無效是的計5 ， 7和42

預約的咨詢數是4

（無效+有效應等於總計）

到目前為止，我只能設法得到Total ，我不知道如何使用IF或其他任何東西確定其他值。

查詢到目前為止

select notes, tLeadStatus.Status, tLeadStatus.StatusID,
       count(*) as Total from LeadManagement.dbo.tLead with (NOLOCK)
left join LeadManagement.dbo.tInternetLead on tLead.Leadid = tinternetlead.leadid
left join LeadManagement..tLeadStatus on tLeadStatus.StatusID = tLead.Status
where (CampaignID = '12327')
  and (registerdate >= '2013-03-01' and registerdate < '2013-04-01')
group by notes,tLeadStatus.StatusID,tLeadStatus.Status

Answer 1

SUM(CASE WHEN StatusID NOT IN (5, 7, 42) THEN 1 ELSE 0 END) AS Valid,
SUM(CASE WHEN StatusID IN (5, 7, 42) THEN 1 ELSE 0 END) AS Invalid,
SUM(CASE WHEN StatusId = 4 THEN 1 ELSE 0 END) AS 'Consults Booked'

Answer 2

您可以使用帶有CASE的聚合函數來獲取其他列：

select notes, 
  count(*) as Total,
  sum(case when tLeadStatus.StatusID not in (5, 7, 42) then 1 else 0 end) Valid,
  sum(case when tLeadStatus.StatusID  in (5, 7, 42) then 1 else 0 end) Invalid,
  sum(case when tLeadStatus.StatusID= 4 then 1 else 0 end) ConsultsBooked
from LeadManagement.dbo.tLead with (NOLOCK)
left join LeadManagement.dbo.tInternetLead 
  on   tLead.Leadid = tinternetlead.leadid
left join LeadManagement..tLeadStatus 
  on tLeadStatus.StatusID = tLead.Status
where (CampaignID = '12327')
  and (registerdate >= '2013-03-01' and registerdate < '2013-04-01')
group by notes