Cypher 25 cheat sheet tags (neo4j#1247)

Co-authored-by: Richard Sill <[email protected]>

Author: JPryce-Aklundh

modules/ROOT/pages/clauses/create.adoc

@@ -234,6 +234,7 @@ This is because a relationship can only have exactly one type.
 ----
 
 .Create nodes and relationships using dynamic node labels and relationship types
+// tag::clauses_create_dynamic_create[]
 [source, cypher]
 ----
 CREATE (greta:$($nodeLabels) {name: 'Greta Gerwig'})
@@ -242,6 +243,7 @@ UNWIND $movies AS movieTitle
 CREATE (greta)-[rel:$($relType)]->(m:Movie {title: movieTitle})
 RETURN greta.name AS name, labels(greta) AS labels, type(rel) AS relType, collect(m.title) AS movies
 ----
+// end::clauses_create_dynamic_create[]
 
 .Result
 [role="queryresult",options="footer",cols="4*<m"]

modules/ROOT/pages/clauses/finish.adoc

@@ -2,17 +2,19 @@
 [[query-finish]]
 = FINISH
 
-A query ending in `FINISH` — instead of `RETURN` — has no result but executes all its side effects.
+A query ending in `FINISH` -- instead of `RETURN` -- has no result but executes all its side effects.
 `FINISH` was introduced as part of Cypher's xref:appendix/gql-conformance/index.adoc[].
 
 The following read query successfully executes but has no results:
 
 .Query
+// tag::clauses_finish_match[]
 [source, cypher]
 ----
 MATCH (p:Person)
 FINISH
 ----
+// end::clauses_finish_match[]
 
 The following query has no result but creates one node with the label `Person`:
 

modules/ROOT/pages/clauses/foreach.adoc

@@ -33,15 +33,17 @@ CREATE
 [[foreach-mark-all-nodes-along-a-path]]
 == Mark all nodes along a path
 
-This query will set the property `marked` to `true` on all nodes along a path.
+This query sets the property `marked` to `true` on all nodes along a path.
 
 .Query
+// tag::clauses_foreach_node[]
 [source, cypher, indent=0]
 ----
 MATCH p=(start)-[*]->(finish)
 WHERE start.name = 'A' AND finish.name = 'D'
 FOREACH (n IN nodes(p) | SET n.marked = true)
 ----
+// end::clauses_foreach_node[]
 
 .Result
 [role="queryresult",options="footer",cols="1*<m"]
@@ -51,3 +53,47 @@ d|Rows: 0 +
 Properties set: 4
 |===
 
+
+[[foreach-mark-all-relationships-along-a-path]]
+== Mark all relationships along a path
+
+This query sets the property `marked` to `true` on all relationships along a path.
+
+// tag::clauses_foreach_relationship[]
+[source, cypher, indent=0]
+----
+MATCH p=(start)-[*]->(finish)
+WHERE start.name = 'A' AND finish.name = 'D'
+FOREACH ( r IN relationships(p) | SET r.marked = true )
+----
+// end::clauses_foreach_relationship[]
+
+.Result
+[role="queryresult",options="footer",cols="1*<m"]
+|===
+|(empty result)
+d|Rows: 0 +
+Properties set: 3
+|===
+
+[[foreach-create-new-nodes-form-a-list]]
+== Create new nodes from a list of name labels
+
+This query creates a new node for each label in a list.
+
+.Query
+// tag::clauses_foreach_create[]
+[source, cypher, indent=0]
+----
+WITH ['E', 'F', 'G'] AS names
+FOREACH ( value IN names | CREATE (:Person {name: value}) )
+----
+// end::clauses_foreach_create[]
+
+.Result
+[role="queryresult",options="footer",cols="1*<m"]
+|===
+1+|(empty result)
+1+d|Rows: 0 +
+Nodes created: 3
+|===

modules/ROOT/pages/clauses/limit.adoc

@@ -166,12 +166,14 @@ Properties set: 1
 `LIMIT` can be used as a standalone clause, or in conjunction with xref:clauses/order-by.adoc[`ORDER BY`] or xref:clauses/skip.adoc[`SKIP`]/xref:clauses/skip.adoc#offset-synonym[`OFFSET`].
 
 .Standalone use of `LIMIT`
+// tag::clauses_limit_standalone[]
 [source, cypher]
 ----
 MATCH (n)
 LIMIT 2
 RETURN collect(n.name) AS names
 ----
+// end::clauses_limit_standalone[]
 
 .Result
 [role="queryresult",options="header,footer",cols="1*<m"]
@@ -185,6 +187,7 @@ The following query orders all nodes by `name` descending, skips the two first r
 It then xref:functions/aggregating.adoc#functions-collect[collects] the results in a list.
 
 .`LIMIT` used in conjunction with `ORDER BY` and `SKIP`
+// tag::clauses_limit[]
 [source, cypher]
 ----
 MATCH (n)
@@ -193,6 +196,7 @@ SKIP 2
 LIMIT 2
 RETURN collect(n.name) AS names
 ----
+// end::clauses_limit[]
 
 .Result
 [role="queryresult",options="header,footer",cols="1*<m"]

modules/ROOT/pages/clauses/load-csv.adoc

@@ -46,12 +46,14 @@ By default, paths are resolved relative to the Neo4j import directory.
 ----
 
 .Query
+// tag::clauses_load_csv_local_files[]
 [source, cypher]
 ----
 LOAD CSV FROM 'file:///artists.csv' AS row
 MERGE (a:Artist {name: row[1], year: toInteger(row[2])})
 RETURN a.name, a.year
 ----
+// end::clauses_load_csv_local_files[]
 
 .Result
 [role="queryresult",options="header,footer",cols="2*<m"]
@@ -112,12 +114,14 @@ However, this means that insecure URLs on virtual hosts will not function unless
 ----
 
 .Query
+// tag::clauses_load_csv_remote_locations[]
 [source, cypher]
 ----
 LOAD CSV FROM 'https://data.neo4j.com/bands/artists.csv' AS row
 MERGE (a:Artist {name: row[1], year: toInteger(row[2])})
 RETURN a.name, a.year
 ----
+// end::clauses_load_csv_remote_locations[]
 
 .Result
 [role="queryresult",options="header,footer",cols="2*<m"]
@@ -308,7 +312,7 @@ It also mitigates the risk of Cypher injection.
 (For more information about Cypher injection, see link:https://neo4j.com/developer/kb/protecting-against-cypher-injection/[Neo4j Knowledge Base -> Protecting against Cypher injection]).
 
 .bands-with-headers.csv
-[source, csv, filename="artists-with-headers.csv"]
+[source, csv, filename="bands-with-headers.csv"]
 ----
 Id,Label,Name
 1,Band,The Beatles
@@ -318,12 +322,14 @@ Id,Label,Name
 ----
 
 .Query
-[source, cypher, role=test-skip]
+// tag::clauses_load_csv_dynamic_columns[]
+[source, cypher]
 ----
 LOAD CSV WITH HEADERS FROM 'file:///bands-with-headers.csv' AS line
 MERGE (n:$(line.Label) {name: line.Name})
 RETURN n AS bandNodes
 ----
+// end::clauses_load_csv_dynamic_columns[]
 
 .Result
 [role="queryresult",options="header,footer",cols="1*<m"]
@@ -705,6 +711,7 @@ person_tmdbId,bio,born,bornIn,died,person_imdbId,name,person_poster,person_url
 The below query uses a xref:subqueries/call-subquery.adoc#variable-scope-clause[variable scope clause] to import variables into the `CALL` subquery.
 
 .Query
+// tag::clauses_load_csv_transactions[]
 [source, cypher]
 ----
 LOAD CSV WITH HEADERS FROM 'https://data.neo4j.com/importing-cypher/persons.csv' AS row
@@ -713,6 +720,7 @@ CALL (row) {
   SET p.name = row.name, p.born = row.born
 } IN TRANSACTIONS OF 200 ROWS
 ----
+// end::clauses_load_csv_transactions[]
 
 .Result
 [source, role="queryresult"]
@@ -747,11 +755,13 @@ A common use case for this function is to generate sequential unique IDs for CSV
 ----
 
 .Query
+// tag::clauses_load_csv_linenumber[]
 [source, cypher]
 ----
 LOAD CSV FROM 'file:///artists.csv' AS row
 RETURN linenumber() AS number, row
 ----
+// end::clauses_load_csv_linenumber[]
 
 .Result
 [role="queryresult",options="header,footer",cols="2*<m"]
@@ -782,11 +792,13 @@ The xref:functions/load-csv.adoc#functions-file[`file()`] function provides the
 ----
 
 .Query
+// tag::clauses_load_csv_file[]
 [source, cypher, role=test-result-skip]
 ----
 LOAD CSV FROM 'file:///artists.csv' AS row
 RETURN DISTINCT file() AS path
 ----
+// end::clauses_load_csv_file[]
 
 .Result
 [role="queryresult",options="header,footer",cols="1*<m"]
@@ -833,6 +845,7 @@ Id,Name,Year
 ----
 
 .Query
+// tag::clauses_load_csv_headers[]
 [source, cypher]
 ----
 LOAD CSV WITH HEADERS FROM 'file:///artists-with-headers.csv' AS row
@@ -841,6 +854,7 @@ RETURN
   a.name AS name,
   a.year AS year
 ----
+// end::clauses_load_csv_headers[]
 
 .Result
 [role="queryresult",options="header,footer",cols="2*<m"]
@@ -876,11 +890,13 @@ If you try to import a file that doesn't use `,` as field delimiter and you also
 ----
 
 .Query
+// tag::clauses_load_csv_field_terminator[]
 [source, cypher]
 ----
 LOAD CSV FROM 'file:///artists-fieldterminator.csv' AS row FIELDTERMINATOR ';'
 MERGE (:Artist {name: row[1], year: toInteger(row[2])})
 ----
+// end::clauses_load_csv_field_terminator[]
 
 .Result
 [source, role="queryresult"]