sql - Query relations within the same table -


I have a table of entities , which relate to multiple relationships from each other You can keep the second, using the junction table. At first glance, the design may look faulty and suggests a separate table for each type of unit. The thing is, the institutions are normal, and fully user-defined. They can be completely linked to the ad hoc and each unit can have unlimited connections. Here is a simple example of my tables: 

  institutions ------------ unit | ID | Type ------------------- Events | 1 | Request String | 2 | Activity Dinner | 3 | Activity Angela | 4 | Person enders | 5 | Person Michael | 6 | Person junction ---------------- Left | Correct ---------------- 1 | 2 / Connect Request - & gt; Stall 2 4 / Connect Stall - & gt; Angela 1 | 3 / Connect Request - & gt; Dinner 3 5 // Connect Dinner - & gt; Enders 3 | 6 // Connect Dinner - & gt; Michael   
 For my question now:  
 I want to inquire from the perspective of various institutions. It is said that I would like to see  request  and see what they have  actions , and any  person  participate in every activity. I would like to get a result by:  
  request | Activity | Person ----------------------------- Event | Stole | Angela | Dinner Enders | Michael   
 I also see, for example, to flip the coin and see  Individuals  and what they  request  will be present Like:  
  person | Request ----------------- Angela | Event Enders | Event Michael | Event   
 How can I write a question to get such results, and is it possible with the existing structure? I've spent more time on googling and testing with no luck, and I'm very grateful for any help.   
 
 
 how do you do this  
  SELECT e1.Entity request, E2.Entity activity, e3.Nets: Junctions j1 JOIN Junctions j2 ON j1 'Wright` = J2. Left 'Joint entities E1 on J1' left '= E1 INDTI E2 ON J1 'Right' = E2. Indits atees E3 on J2 'Right' = e 3. id;   
   
   
   
   
 SELECT j1 'Left' request, J1 Right 'activity, J.2' Write 'Joint Junkies J2 On J1' Right '= j 2.' Left '; To change   
 and then  id  s, as you can see, every  entered in  unit  Once for .  
 But, still, I still think this architecture is awful, and it needs to be redesigned.

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