寻找一个getdate / dateadd陈述式来做1年+/- 15天

Question

-- This is my current code which will allow for me to see all our work orders that have been submitted within the past week, and lets me know if any of the same work orders have appear 6 months ago.

SELECT 
  A.tagnumber, 
  count(*) AS CountTotal
FROM 
  v_workorder A 
WHERE 
  --Date range Within Today and 6 months ago
  wo_requestDate BETWEEN DATEADD(month, -6, GETDATE()) AND GETDATE() 
  AND
    EXISTS 
    ( -- Date range Within Today and 7 days ago
      select 
        tagnumber 
      FROM 
        v_workorder 
      WHERE 
        wo_requestDate BETWEEN DATEADD(DAY,-7,GETDATE()) AND GETDATE() 
    ) 
  AND
  A.wc_description = 'Corrective'       
  AND           
  A.itemtype_name = 'Building'
GROUP BY A.tagnumber
ORDER BY CountTotal DESC

--However, Now I would like for my first variable of the getdate/adddate. To check back 1 year ago, +/- 15 days. So essentially 1 year and 15 days back instead of 6 months.

Answer 1

For past 1 year +/- 15 Days

SELECT A.tagnumber, count(*) AS CountTotal
 FROM v_workorder A 
 WHERE wo_requestDate BETWEEN DATEADD(day, -15, DATEADD(year, -1, GETDATE())) AND DATEADD(day, 15, DATEADD(year, -1, GETDATE()))
    AND
        EXISTS ( select tagnumber FROM v_workorder WHERE  wo_requestDate BETWEEN DATEADD(DAY,-7,GETDATE()) AND GETDATE() )
    AND
            A.wc_description = 'Corrective'     AND         A.itemtype_name = 'Building'
 GROUP BY A.tagnumber
 ORDER BY CountTotal DESC

For 1 year

SELECT ...
FROM ...
WHERE wo_requestDate BETWEEN DATEADD(year, -1, GETDATE()) AND GETDATE()
AND...;

For 15 Days

SELECT ...
FROM ...
WHERE wo_requestDate BETWEEN DATEADD(day, -15, GETDATE()) AND GETDATE()
AND...;

Other possible options of DATEADD()

year
quarter
month
dayofyear
day
week
weekday
hour
minute
second
millisecond

See more here .

.

Answer 2

To eliminate issues with the time component of datetime:

CAST(GETDATE() AS DATE

Find the date from a year ago:

SELECT DATEADD(YEAR, -1, CAST(GETDATE() AS DATE));

From there, subtract 15 days and add 15 days in your end points.

...
WHERE 
  wo_requestDate >= DATEADD(DAY, -15, DATEADD(YEAR, -1, CAST(GETDATE() AS DATE)))
  AND
  wo_requestDate < DATEADD(DAY, 15, DATEADD(YEAR, -1, CAST(GETDATE() AS DATE)))

I prefer >= and < to BETWEEN , especially with dates, just to avoid any ambiguity with the time component, so you may want to add 16 days to the last parameter if you want the range to include the 15th day out.