如果我在SELECT和FROM以及FROM和WHERE之间放置DateAdd函数

Question

我创建了一个必须由datetimepicker控制的查询，我的目标是我将获得datetimepicker设置的指定日期的下7天

我在我的查询中尝试了它，但它似乎没有任何区别或我的查询代码是错误的

     select count(PatientID) as id, Patient.FirstName, Patient.LastName, 
      Patient.MiddleName, " +"Patient.Nickname, Patient.Age, 
       Patient.Birthday, Patient.Sex, Patient.Occupation, 
       Patient.CompleteAddress, Patient.MobilePhone, Patient.Phone, " +
       "Patient.PersonTCI, Patient.PContact, Patient.DateofC 

       from Patient 

        Where DATEADD ('d' , 7 , datetimepicker1 ) and Active = '1' " + "

        Group by Patient.FirstName, 
        Patient.LastName, Patient.MiddleName, 
        Patient.Nickname, Patient.Age, Patient.Birthday, Patient.Sex, 
        Patient.Occupation, Patient.CompleteAddress, " +
        "Patient.MobilePhone, Patient.Phone, Patient.PersonTCI, 
          Patient.PContact, Patient.DateofC"

Answer 1

在where子句中，缺少日期比较的条件。这个怎么样。

var dateFrompicker = datetimepicker1.AddDay(7);
select count(PatientID) as id, Patient.FirstName, Patient.LastName, 
      Patient.MiddleName, " +"Patient.Nickname, Patient.Age, 
       Patient.Birthday, Patient.Sex, Patient.Occupation, 
       Patient.CompleteAddress, Patient.MobilePhone, Patient.Phone, " +
       "Patient.PersonTCI, Patient.PContact, Patient.DateofC 

       from Patient 

        Where dateFrompicker >  Patient.DateofC   and Active = '1' " + "

        Group by Patient.FirstName, 
        Patient.LastName, Patient.MiddleName, 
        Patient.Nickname, Patient.Age, Patient.Birthday, Patient.Sex, 
        Patient.Occupation, Patient.CompleteAddress, " +
        "Patient.MobilePhone, Patient.Phone, Patient.PersonTCI, 
          Patient.PContact, Patient.DateofC"

Answer 2

    select count(PatientID) as id, Patient.FirstName, Patient.LastName, 
          Patient.MiddleName, " +"Patient.Nickname, Patient.Age, 
           Patient.Birthday, Patient.Sex, Patient.Occupation, 
           Patient.CompleteAddress, Patient.MobilePhone, Patient.Phone, " +
           "Patient.PersonTCI, Patient.PContact, Patient.DateofC 
       from Patient 

        Where Patient.DateofC>=Patient.DateofC and Patient.DateofC<= datetimepicker1.value.AddDay(7)     and Active = '1' " + "

        Group by Patient.FirstName, 
        Patient.LastName, Patient.MiddleName, 
        Patient.Nickname, Patient.Age, Patient.Birthday, Patient.Sex, 
        Patient.Occupation, Patient.CompleteAddress, " +
        "Patient.MobilePhone, Patient.Phone, Patient.PersonTCI, 
          Patient.PContact, Patient.DateofC"