add q2.gsql

demos/guru_scripts/docker/tutorial/4.x/script/q2.gsql

@@ -0,0 +1,29 @@
+USE GRAPH financialGraph
+
+# create a query
+CREATE OR REPLACE QUERY q2 (string accntName) SYNTAX v3 {
+
+  // declare an local sum accumulator; you can keep adding values into it
+  // "local accumulator" means each vertex will have an accumulator of
+  // the declared type and can be accumulated into based on the 
+  // FROM clause pattern.
+  SumAccum<int> @totalTransfer = 0;
+
+  // match an edge pattern-- symbolized by ()-[]->()
+  // v is a vertex set variable holding the selected vertex set
+  v = SELECT b
+      FROM (a:Account {name: accntName})-[e:transfer]->(b:Account)
+      //for each matched row, do the following accumulation
+      ACCUM  b.@totalTransfer += e.amount;
+
+  //output each v and their static attribute and runtime accumulators' state
+  PRINT v;
+
+}
+
+#compile and install the query as a stored procedure
+install query q2
+
+#run the query
+run query q2("Scott")
+