Graph Queries Expanded Search Patterns

You can expand an existing graph query simply by adding it an edge-and-node pair, as follows.

• Initial query:
  Here we find all the orders made by a company we want to investigate, and all the products that each order includes.
  

  match
      (Orders as orders 
         where Company = "companies/34-A")-
      [Lines[].Product as product]->
      (Products as products)

  

  Initial Query Results

• Expanded query:
  And here we expand the query to also find each product's supplier.
  

  match
      (Orders as orders 
         where Company = "companies/34-A")-
      [Lines[].Product as product]->
      (Products as products)-
      [Supplier as supplier]->
      (Suppliers as suppliers)

  

  Expanded Query Results

  The expanded search pattern locates a new layer of relations and data nodes, by querying retrieved products and finding which suppliers they lead to.

• Directional Queries
  In each section of the query, an origin data-node clause is directed to a destination data-node clause to its right or to its left.
  The following two queries for example, searching for orders to France, are equivalent.

  To The Right	To The Left
  match (Orders as orders where ShipTo.Country = "France")- [Company as company]-> (Companies as companies)	match (Companies as companies) <-[Company as company] -(Orders as orders where ShipTo.Country = "France")

• Bi-Directional Queries
  A query may be combined of sections that point to the right and to the left.
  Here is one:

  match 
       (Employees as employees)
       <-[Employee as handledBy]
       -(Orders as orders)-
       [Company as orderedBy]->
       (Companies as companies)

  • The first part heads left, finding orders and the employees that handle them.
    

    (Employees as employees)
         <-[Employee as handledBy]
         -(Orders as orders)

  • The second part heads right, finding orders and the companies that make these orders.
    

    (Orders as orders)-
         [Company as orderedBy]->
         (Companies as companies)

  • Orders, common to both parts, appears only once.
    It is origin for both sections.

  The query produces these results:

  

  Bi-Directional Query Results

• It is equivalent to the following less concise multi-segment query.

  Multi-Segment (Intersection)	Bi-Directional
  match //First Segment (Orders as orders)- [Employee as employee]-> (Employees as employees) and //Second Segment (orders)- [Company as company]-> (Companies as companies)	match (Employees as employees) <-[Employee as handledBy] -(Orders as orders)- [Company as orderedBy]-> (Companies as companies)