cypher-constraints-indexes - Update to reflect changes in Neo4j (#428)

* update to reflect changes in Neo4j

* post review change

Author: martinohanlon

asciidoc/courses/cypher-indexes-constraints/modules/2-constraints/lessons/01-constraint-overview/lesson.adoc

@@ -1,10 +1,10 @@
 = Constraints in Neo4j
-:type: video
+:type: lesson
 :order: 1
 :sandbox: true
 
-[.video]
-video::N_m8Qb6vnfA[youtube,width=560,height=315]
+// [.video]
+// video::N_m8Qb6vnfA[youtube,width=560,height=315]
 
 //https://youtu.be/N_m8Qb6vnfA
 
@@ -13,15 +13,16 @@ video::N_m8Qb6vnfA[youtube,width=560,height=315]
 
 A constraint is implemented internally as an index.
 It is used to constrain what is added to the graph.
-There are three types of constraints you can define:
 
-* Uniqueness for a single node property value or a set of node property values.
-* Existence for a property of a node or relationship.
-* Existence and uniqueness for a  node property value or a set of node property values (Node key).
+You can define link:https://neo4j.com/docs/cypher-manual/current/constraints/[different types of constraint^] that apply to nodes with a specific label or relationships of a type, including:
+
+* Property uniqueness constraints - ensure that all values for a property are unique.
+* Property existence constraints - ensure that a property exists.
+* Key constraints - ensure that a combination of properties exists and is unique.
 
 === Uniqueness constraints
 
-A uniqueness constraint can be defined for a property of a node with a given label.
+A uniqueness constraint can be defined for a property.
 
 For example, in the Movie graph, we uniquely identify every Person node.
 To do this, we identify a property whose value will be unique for all nodes with the Person label.
@@ -128,11 +129,11 @@ RETURN p
 
 You will learn how to create and test an existence constraint later in this module.
 
-=== Node key constraint
+=== Key constraint
 
-A node key is a specialized type of constraint in the graph that enables you to define a set of properties for a node label that must:
+A key is a specialized type of constraint in the graph that enables you to define a set of properties for a node label or relationship type that must:
 
-. Exist for all nodes with that label.
+. Exist for all nodes or relationships with that label or type.
 . Be unique for all values.
 
 For example, suppose you want to ensure that all Person nodes in the graph have unique values for Person.name and Person.tmdbId.

asciidoc/courses/cypher-indexes-constraints/modules/2-constraints/lessons/01-constraint-overview/questions/1-select-answer.adoc

@@ -1,19 +1,19 @@
 [.question]
 = 1. What type of constraint can you define to ensure a _set of property values_ is unique?
 
-* [ ] Uniqueness on a node property.
+* [ ] Uniqueness on a property.
 * [ ] Uniqueness on a set of relationship type properties.
-* [x] Node key for a set of properties of a node label.
-* [ ] Uniqueness key for a set of properties of a node label.
+* [x] Key constraint for a set of properties.
+* [ ] Uniqueness key for a set of properties.
 
 [TIP,role=hint]
 .Hint
 ====
-There is one construct used to uniquely identify property values for a set of node labels.
+There is one construct used to uniquely identify property values.
 ====
 
 [TIP,role=solution]
 .Solution
 ====
-A Node key is used to ensure that a set of property values for all nodes of that label type are unique in the graph.
+A key constraint is used to ensure that a set of property values for all nodes or relationships of that label or type are unique in the graph.
 ====

asciidoc/courses/cypher-indexes-constraints/modules/2-constraints/lessons/01-constraint-overview/questions/2-select-answer.adoc

@@ -1,19 +1,19 @@
 [.question]
-= 2. What type of constraint can be created for node properties or relationship properties?
+= 2. What type of constraint can be created?
 
-* [ ] Node key
-* [ ] Uniqueness
+* [x] Key
+* [x] Uniqueness
 * [x] Existence
 * [ ] IS NULL
 
 [TIP,role=hint]
 .Hint
 ====
-There is only one type of constraint that you can define on node properties or relationship properties.
+You cannot create a constraint to ensure a property doesn't exist. 
 ====
 
 [TIP,role=solution]
 .Solution
 ====
-The correct answer is Existence constraint.
+The correct answer are Key, Uniqueness, and Existence.
 ====