编写SQL Server案例声明

Question

运行select语句后，我得到以下值“see image”

我想要case语句检查是否BloodPressureSystolic == 0，如果是，请从BPSRSit和BPSRSit中提取值并添加然后将值添加到像这样的“115/65”临时表可以有人告诉我如何编写这样的案例。

这是我的select语句，我想将一个case语句添加到

SELECT  ad.ApptDate ,
    ISNULL(v.Temperature, 0) AS Temperature ,
    ISNULL(v.PS, 0) AS PerfStatus ,
    v.*
FROM    vitals v ,
    AppointmentData ad
WHERE   v.PatientId = 11
    AND ad.ApptId = v.ScheduleId
    AND ad.ApptDate < GETDATE()
    AND ad.StatusId NOT IN ( 3, 8 )

Answer 1

 CASE WHEN BloodPressureSystolic = 0 AND BloodPressureDiastolic = 0 THEN
      CAST(BPSRSit AS VARCHAR(10)) + '/' + CAST(BPDRSit AS VARCHAR(10)) END

Answer 2

对于MySQL，您有两种使用CASE语句的选项。 http://dev.mysql.com/doc/refman/5.0/en/case.html

CASE [case value] WHEN [value] THEN [output] END

OR

CASE WHEN [search conditions] THEN [output] END

关于你的问题你可以使用这样的东西：

select ad.ApptDate ,
    ISNULL(v.Temperature, 0) as Temperature, 
    ISNULL(v.PS, 0) as PerfStatus,
    v.*, 
    CASE WHEN (BloodPressureSystolic = 0 AND BloodPressureDiastolic = 0) THEN CONCAT(BPSRSit, "/", BPDRSit) END AS myOutput 
from vitals v,AppointmentData ad
Where v.PatientId = 11
    And ad.ApptId = v.ScheduleId
    and ad.ApptDate < GETDATE()
    and ad.StatusId not in (3,8)