AND & Intersection operator in combined query.

Hi All,

To create a report ,I have dragged output fields in result objects pane.

Also I have dragged User id ,user name & joining date  as prompt with AND condition in query_Filter .

i.e.,  User id  -------------

    &  user name---------------

   &    joining date------------

My query is instead of AND condition ,if I use combined query with intersection operator like below ?

              |User id  -------------

              |

              |user name---------------

Intersec
              |

              |

              |joining date------------

Please let me know difference between AND and Intersection operator in combined query.

Thanks

Ram