SQL Server Query with Nulls and OR with dates

where active=1
   OR ( active=0
     AND  (
              ( startdate < convert( datetime, -datediff(day,getdate(),day(getdate())-1) ) )
              AND
              ( repeatdate < convert( datetime, -datediff(day,getdate(),day(getdate())-1) ) or repeatdate is null )
            )
    )

try this.

SELECT * 
  FROM your_table 
 WHERE (DATEPART(MONTH,startdate) <> DATEPART(MONTH,GETDATE()) 
        AND (DATEPART(MONTH,repeatdate) <> DATEPART(MONTH,GETDATE()) 
              OR repeatdate IS NULL)) 
        OR active = 1

Select allOpen in new window

Both answers mentioned above (kinghtEknight and Sharath123) are correct based on one particular understanding of the need.

However, the question sounded ambiguous to me and I understood your requirement slightly differently as follows:
1. Include only rows where active = 1
2. Within the above subset, if repeatdate is NULL, include those rows; otherwise, if repeatdate is not NULL, then include those rows only if both their startdate and repeatdate fall outside the current month

With this understanding, I have included below a file containing sample data, suggested SQL and result rows. Check out and post your feedback as to what was your actual requirement and whether any of the above answers have been helpful.

 A-date-with-NULLs.txt

mmmm , so what happens to records from 1/4/2010 , they will be excluded aswell wont they ?

gladfellow, i dont this your example worked as it would still bring results for the current month
for startdate or repeatdate, your results show this. (results line 3)

Select * From Table
where month(startdate) = month(getdate())
and year(startdate) = year(getdate())
and month(repeatdate) = month(getdate())
and year(repeatdate) = year(getdate())
and active =1
and repeatdate is null

Sorry Ignore above one



Select * From Table
where month(startdate) <> month(getdate())
and year(startdate) = year(getdate())
and month(repeatdate) <> month(getdate())
and year(repeatdate) = year(getdate())
and active =1
and repeatdate is null

Alpesh , the date cannot be NULL and less than current month. There has to be an OR in there surely

> "exclude records where startdate is in this month"

I interpreted this to mean the current month and year -- is this correct?  Does my post satisfy all the requirements?

It would be helpful, if you post the exact result set that you expect, based on some sample data. Thanks.

- Venkat

active startdate repeatdate
1       1/4/2011  NULL
1        1/3/2011  NULL
1        1/3/2011  1/4/2011
1        1/4/2010   15/3/2011
1        1/3/2010   1/4/2011
0         1/2/2011   1/3/2011


I want to receive the following results
1        1/3/2011  NULL
1        1/4/2010   15/3/2011

based on the fact that the startdate nor the repeatdate are no in this month. and active =1
hope that makes sense.

so you don't want any rows where active=0 then?

yes active must equal 1

okay ... originally you said:  "and include all records where active=1"  so I assumed that all the other criteria must apply only to rows where active = 0.

Also, what is the date format you are using in the expected results above?  is it mm/dd/yyyy or dd/mm/yyyy ?


 where active=1
  AND  (
             ( startdate < convert( datetime, -datediff(day,getdate(),day(getdate())-1) ) )
             AND
             ( repeatdate < convert( datetime, -datediff(day,getdate(),day(getdate())-1) ) or repeatdate is null )
         )

thanks for that

date format is dd/mm/yyyy

the code you wrote brings back 11/4/2011 as included.

I want to exclude records where startdate is in this month
and exclude records were repeatdate is in this month

is  11/4/2011  a startdate or a repeatdate?

also, what is the result of this query on your system?

select convert( datetime, -datediff(day,getdate(),day(getdate())-1) ) as day1

sorry repeatdate

Let's focus on the startdate first ... does the following query work with respect to your startdate criteria?

  WHERE active=1
     AND  startdate < convert( datetime, -datediff(day,getdate(),day(getdate())-1) )

If so then we can add in the criteria for repeatdate later ...

yes this works, i just tested the same SQL , and it appears to exclude all aprils startdates

now mr knight, thats a winner , thank you very much , what a nightmare.

cheers

brilliant