Database Reference
In-Depth Information
Starting nodes are presented as a comma-separated list, with each node having its own
identifier that can be used throughout the query . When you're matching patterns, all
starting nodes can be part of a single pattern, or they can be used in separate patterns as
in this example . Both patterns in this example refer to the
movie
node (called by the
same name in both patterns, so it represents the same node), which is the result of your
Cypher query
.
6.2.3. Filtering data
Starting nodes and graph patterns are sometimes not enough to get the results you need us-
ingaCypherquery.Insomecases,you'llneedtoperformadditional filtering onnodesand
relationships to determine what to return. Just as in SQL for relational databases, the query
filtering in Cypher is performed using the
where
clause.
Typically, the
where
clause filters the results based on some property of a node or rela-
tionship. Let's look at an example that finds all friends of user John who were born after
1980. Let's assume that every
user
node has a
yearOfBirth
integer property holding
the user's year of birth. The following snippet illustrates the solution:
You find the starting node by performing the index lookup
, and you pattern match
the
friend
nodes with an
IS_FRIEND_OF
relationship regardless of the direction
. Next, you filter only the matching
friend
nodes that have a
yearOfBirth
property
greater than 1980 . Because
yearOfBirth
is an integer property, you can perform a
standard number comparison in the
where
clause.
