Help with T SQL statement

hmm, not sure about your exact logic, but take a look at MERGE, e.g.

MERGE Table2 Dst
USING (   SELECT T.Column1 ,
                 T.Column2 ,
                 T.Column3
          FROM   Table1 T ) Src
ON (   Dst.Column1 = Src.Column1
       AND Dst.Column2 != SrcColumn2
       AND Dst.Column4 = 'Y' )
WHEN MATCHED THEN UPDATE SET Dst.Column4 = '?'
WHEN NOT MATCHED THEN INSERT ( Column1 ,
                               Column2 ,
                               Column4 )
                      VALUES ( Src.Column1, Column2, '?' )
OUTPUT DELETED.* ,
       $ACTION ,
       INSERTED.*;

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      update table2.field4
      create new record in table2

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This bit is not very clear on your question. Are you doing BOTH? An update and creating a new record on Table2? What is the update going to be? Using MERGE, you will not be able to execute both. However, you could use the MERGE to perform the inserts, OUTPUT these results into a temporary table, and then execute the updates based on the temporary table. Something like:

-- Create a temporary table variable to hold the output actions.  
DECLARE @changes TABLE(Change VARCHAR(20), T2RecordID, T2Field1, T2Field2, T2Field4, T2OldField4  );

MERGE Table2 as target
USING Table1 as source
ON ( target.field1 = source.field1 AND target.Column4 = 'Y' )
WHEN NOT MATCHED THEN INSERT ( fiel1, field2, field4 )
                      VALUES ( source.field1, source.field2, 'Y' )
WHEN MATCHED AND target.field2 <> source.field2 THEN UPDATE SET target.Column4 = '?'
OUTPUT $action, inserted.id /*assuming an autonumber field here*/, inserted.field1, inserted.field2, inserted.field4, deleted.field4 INTO @changes;

--@changes will now contain a record of all the changes that have been made. Use this data to do the "create new record in table2" as necessary.

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I don't know what you want to put in "field4" in the new row, so you'll have to fill that in below.  I'm also assuming field2 can't be NULL -- if it can be, we'll have to adjust the comparison on field2.


INSERT INTO Table2 ( field1, field2, field4 )
SELECT t1.field1, t1.field2, ?.?
FROM Table1 t1
INNER JOIN Table2 t2 ON t2.field1 = t1.field1 AND t2.field4 = 'Y' AND t2.field2 <> t1.field2

UPDATE t2
SET field2 = t1.field2
FROM Table2 t2
INNER JOIN Table2 t2 ON t2.field1 = t1.field1 AND t2.field4 = 'Y' AND t2.field2 <> t1.field2

Great, glad I helped you arrive at a solution!