XML Query Help row with no data

Question

declare @address table
AddressID int,
AddressType varchar(12),
Address1 varchar(20),
Address2 varchar(20),
City varchar(25),
AgentID int
insert into @address 
select 1, 'Home', 'abc', 'xyz road', 'RJ', 1 union all
select 2, 'Office', 'temp', 'ppp road', 'RJ', 1 union all
select 3, 'Home', 'xxx', 'aaa road', 'NY', 2 union all
select 4, 'Office', 'ccc', 'oli Com', 'CL', 2 union all
select 5, 'Temp', 'eee', 'olkiu road', 'CL', 2 union all
select 6, 'Home', 'ttt', 'loik road', 'NY', 3
SELECT a.* from @address a 
where a.AddressID = 1
FOR XML path('Addresses')
SELECT a.* from @address a 
where a.AddressID = 9
FOR XML path('Addresses')
Issue:
As you can see for second query where AddressID = 9 is not exists so xml is not generated but
my expected result is for second query is
<Addresses>
<AddressID />
<AddressType />
<Address1 />
<Address2 />
<City />
<AgentID />
</Addresses>
Thanks in advance for all your help. 

Answer 1

First of all: Your expectation is wrong. Sorry to say that. But your SQL statement for A.AddressID = 9 does not return a row. So no row is converted. I hope you C it: void.
From the XML viewpoint:
<Addresses>
<AddressID />
<AddressType />
<Address1 />
<Address2 />
<City />
<AgentID />
</Addresses>
is equivalent to
<Addresses />
which is equivalent to
void
You C. Sorry got infeCted some how ;)
The only meaningful result in XML would be:
<Addresses ID="1">
<AddressType>Home</AddressType>
<Address1>abc</Address1>
<Address2>xyz road</Address2>
<City>RJ</City>
<AgentID>1</AgentID>
</Addresses>
<Addresses ID="9"/>
Cause now Addresses (Really? A plural form for a single entity?) transports the meaning, well there is no data (no row) for it. We tried to find it, but we failed. In opposite to
<Addresses>
<AddressID>9</AddressID>
<AddressType />
<Address1 />
<Address2 />
<City />
<AgentID />
</Addresses>
<Addresses ID="9">
<AddressType />
<Address1 />
<Address2 />
<City />
<AgentID />
</Addresses>
Which says: well, we have a row with the ID 9, but the rest of the columns is empty.
The problem is mere semantics. But it's an important difference.
Now for your problem: Why do you expect this? Where do can you work with such a kind of informationless result?
btw, as you're using already a table variable (+1), you should also use
table value constructors like
INSERT INTO @address
VALUES ( 1, 'Home', 'abc', 'xyz road', 'RJ', 1 ),
( 2, 'Office', 'temp', 'ppp road', 'RJ', 1 ),
( 3, 'Home', 'xxx', 'aaa road', 'NY', 2 ),
( 4, 'Office', 'ccc', 'oli Com', 'CL', 2 ),
( 5, 'Temp', 'eee', 'olkiu road', 'CL', 2 ),
( 6, 'Home', 'ttt', 'loik road', 'NY', 3 );
I would use a tally table, when you really need this:
DECLARE @address TABLE
AddressID INT ,
AddressType VARCHAR(12) ,
Address1 VARCHAR(20) ,
Address2 VARCHAR(20) ,
City VARCHAR(25) ,
AgentID INT
INSERT INTO @address
VALUES ( 1, 'Home', 'abc', 'xyz road', 'RJ', 1 ),
( 2, 'Office', 'temp', 'ppp road', 'RJ', 1 ),
( 3, 'Home', 'xxx', 'aaa road', 'NY', 2 ),
( 4, 'Office', 'ccc', 'oli Com', 'CL', 2 ),
( 5, 'Temp', 'eee', 'olkiu road', 'CL', 2 ),
( 6, 'Home', 'ttt', 'loik road', 'NY', 3 );
WITH n1
AS ( SELECT *
FROM ( VALUES ( 1), ( 1), ( 1), ( 1) ) Q ( n )
n2
AS ( SELECT a.n
FROM n1 a ,
n1 b ,
n1 c ,
n1 d
NumberTally
AS ( SELECT ROW_NUMBER() OVER ( ORDER BY n ) AS n
FROM n2
SELECT NT.n AS [@ID] ,
a.AddressType ,
a.Address1 ,
a.Address2 ,
a.City ,
a.AgentID
FROM NumberTally NT
LEFT JOIN @address a ON a.AddressID = NT.n
WHERE NT.n IN ( 1, 9 )
FOR XML PATH('Address');
or the void version:
DECLARE @address TABLE
AddressID INT ,
AddressType VARCHAR(12) ,
Address1 VARCHAR(20) ,
Address2 VARCHAR(20) ,
City VARCHAR(25) ,
AgentID INT
INSERT INTO @address
VALUES ( 1, 'Home', 'abc', 'xyz road', 'RJ', 1 ),
( 2, 'Office', 'temp', 'ppp road', 'RJ', 1 ),
( 3, 'Home', 'xxx', 'aaa road', 'NY', 2 ),
( 4, 'Office', 'ccc', 'oli Com', 'CL', 2 ),
( 5, 'Temp', 'eee', 'olkiu road', 'CL', 2 ),
( 6, 'Home', 'ttt', 'loik road', 'NY', 3 );
WITH n1
AS ( SELECT *
FROM ( VALUES ( 1), ( 1), ( 1), ( 1) ) Q ( n )
n2
AS ( SELECT a.n
FROM n1 a ,
n1 b ,
n1 c ,
n1 d
NumberTally
AS ( SELECT ROW_NUMBER() OVER ( ORDER BY n ) AS n
FROM n2
SELECT a.AddressID AS [@ID] ,
a.AddressType ,
a.Address1 ,
a.Address2 ,
a.City ,
a.AgentID
FROM NumberTally NT
LEFT JOIN @address a ON a.AddressID = NT.n
WHERE NT.n IN ( 1, 9 )
FOR XML PATH('Address');