how to find contactid in sql server?

RCustomerId   GiftRegistryId   ContactId   DateActive   DateExpire 
-----------   --------------   ---------   ----------   ----------
62            66               225         NULL         2010-10-11 
62            66               228         2010-10-13   NULL 
62            67               229         NULL         2010-10-20 
62            67               230         2010-10-21   NULL 
62            68               232         NULL         NULL 

To check today date is >= dateexpire

if it is >= i want to check same giftregistryid dateactive date wheather is >= or not.

if geater then equal i no need to display contactid otherwise display contactid.

Eg :

    开发者_C百科  Consider today date id 2010-10-11

      result is    Contactid
                    228
                    229 

You could try:

SELECT ContactId FROM TableName
WHERE GetDate() BETWEEN DateActive AND DateExpire

You'll definitely have to fudge things around by using ISNULL for null dates (I'd include it, but, based on your question, I can't tell how NULL values are handled).

I think what you want is

SELECT
    contactid 
FROM
    yourtable
WHERE
    dateactive >= '2010-10-11' OR dateactive IS NULL AND
    dateexpire <= '2010-10-11' OR dateexpire IS NULL

but it's really hard to understand, sorry.