Cross Reports

Hello people,
how to create cross report? Do I need to use any additional SQL statements? I am trying to create one by using two different DB Queries and it doesn't work. Could you help me out? I tried to make some sql select statements with inner join, but it did not work.

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HI：

     This is an example of data bidirectional expansion for one DB：http://doc.fanruan.com/display/V ... rectional+Expansion
     And for two different DB Queries，you can refer to this demo：