Question

Given two tables:

T1( EntityID int , EmailAddress varchar(55),MaxNumberOfConnections int )

T2( EntityID int , EntityAttributes XML )

How do I insert all the data from T1 into T2 with a single statement in such a way that all the columns in T1 (all but EntityID ) are converted into one XML column in T2 :

T1( 1,'[e-mail]',454)

T2(1, '<Attributes>
          <Attribute EmailAddress="[e-mail]">
          <Attribute MaxNumberOfConnections ="454">
      </Attributes>' )

Answer 1

Here are two solutions based upon my comment –
Single “Attribute” element with multiple attributes:

SELECT
    EntityId,
    (
        SELECT
            EmailAddress AS [Attribute/@EmailAddress],
            MaxNumberOfConnections AS [Attribute/@MaxNumberOfConnections]
        FROM
            T1 i
        WHERE
            i.EntityId = o.EntityId
        FOR XML PATH('Attributes')
    ) AS EntityAttributes 
FROM
    T1 o

Individual element for each field:

SELECT
    EntityId,
    (
        SELECT
            EmailAddress,
            MaxNumberOfConnections
        FROM
            T1 i
        WHERE
            i.EntityId = o.EntityId
        FOR XML PATH('Attributes')
    ) AS EntityAttributes 
FROM
    T1 o