for xml path(string)

for xml path(string)

1    select top 3 LoginId from Users for xml path ('')
     结果：    <LoginId>data1</LoginId>
                  <LoginId>data2</LoginId>
                  <LoginId>data3</LoginId>
2    select top 3 LoginId as [text()] from Users for xml path ('')
     结果：    data1data2data3
3    select top 3 LoginId as [text()]  from Users for xml path ('ui')
     结果：    <ui>data1</ui>
                  <ui>data2</ui>
                  <ui>data3</ui>
4    select top 3 LoginId   from Users for xml path ('ui')
     结果：     <ui>
                          <LoginId>data1</LoginId>
                   </ui>
                   <ui>
                          <LoginId>data2</LoginId>
                   </ui>
                   <ui>
                          <LoginId>data3</LoginId>
                   </ui>