在Microsoft SQL Server Management Studio中计算年龄

Question

I'm doing this but the result give me all the names who they are 30 years and less than 30 years.

This is the database:

• Donor ( Donor-ID, First-name, Last-name, Date-of-birth, Sex, Date-of-donate)
• Donor-phone (Donor-ID, Phone-number)
• Clinic (Clinic-ID, Clinic-name, Clinic-Location)
• Blood (Blood-ID, Blood Type)
• The donate day (Blood Status, Donate Date)
• Employee (Employee-ID, First-name, Last-name, Sex)

I used this code - where is it wrong?

SELECT
    GETDATE () AS FirstName, 
    FirstName, LastName,
    DATEADD(DD, 30, GETDATE()) AS [DateOfDonate- DateOfBirth],
    DATEADD(DD, 1-1-2000, GETDATE()) AS [DonateOfDate]
FROM
    Donor

I need to solve this question: find the names of donors who their age is above 30 years and have donated since 1/1/2000

Answer 1

SELECT
    *
FROM
   donor
WHERE
        [date-of-birth]  <= DATEADD(YEAR, -30, GETDATE())  -- Anyone born more than 30 years ago
    AND [date-of-donate] >= '2000-01-01'                   -- Anyone that donated since 1st Jan 2000

Answer 2

Sorry for the previous typo . I calculated with actual fields and then replaced with yours resulting into the mess. Please use below

  cast(datediff(Year,Date-Of-Birth,getdate()) as nvarchar(100))
+ ' Years , '
+ cast(datediff(Month,Date-Of-Birth,getdate())%12 as nvarchar(100))
+ ' months and '
+ cast(datediff(day,Date-Of-Birth,getdate()) as nvarchar(100))
+' days '

Answer 3

 select  FirstName+" "+ LastName from Donor
 where  datediff(year,Date-of-birth,getdate()) >30 and Date-of-donate>
 convert(date,'Date-of-donate',103)=convert(date,'Date-of-
 donate',103)='1/1/2000'

This will work for you