php - combining results of two select objects Zend\Db\sql\sql -

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I know the way to combine two selected letters will look like this: 

  SELECT Include table A on a table A. In the table that comes from table A. [TableB] .ID = Table A. Select Owner Union Table AID., Table A. Include [Table C] by name [Table C] on right outer table A. tableAId = tableA.Id

But how will it be if I am using SQL Object? 

  $ sql = new SQL ($ Adapter); Select $ = $ sql-> Select (); Select $ - & gt; From (tableA); Select $ - & gt; Any help would be greatly appreciated.   
 
 
 ZF2 has  combine  that acts as a union -  
  $ select1-> Coalition ($ select2);  
 
 I hope this helps someone.

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