Content deleted Content added
No edit summary |
No edit summary |
||
Line 16:
The GQL project draws on multiple sources or inputs, notably existing industrial languages and a new section of the SQL standard. In preparatory discussions within WG3 surveys of the history and comparative content of some of these inputs were presented.<ref name="GQLs history">{{cite web|url=https://s3.amazonaws.com/artifacts.opencypher.org/website/materials/DM32.2/DM32.2-2018-00085R1-recent_history_of_property_graph_query_languages.pdf|title=''An overview of the recent history of Graph Query Languages''|last=Lindaaker|first=Tobias|date=|website=|publisher=opencypher.org|accessdate=October 6, 2019}}</ref>. GQL is intended to draw inspiration from declarative languages which play a similar role to SQL in the building of a database application, but other graph query languages have been defined which offer direct procedural features such as branching and looping['''REF TINKERPOP, GREMLIN'''], ['''REF GQSL'''], and the ability to traverse a graph iteratively['''REF TINKERPOP, GREMLIN''']<ref name="Wood Graph Query">{{cite web|url=https://dl.acm.org/ft_gateway.cfm?id=2206879&ftid=1212198&dwn=1&CFID=106456621&CFTOKEN=92daacebb1744396-220C1ECA-F98C-4552-03541423FDE04D18|title=''Query languages for graph databases. '', SIGMOD Rec. 41, 1 (April 2012), 50-60. DOI: 10.1145/2206869.2206879.|last=Wood|first=Peter T.|date=|website=|publisher=ACM|accessdate=October 25, 2019}}</ref>['''REF MARCELO'''].
=== SQL/PGQ Property Graph
Prior work by WG3 and SC32 mirror bodies, particularly in INCITS DM32, has helped to define a new planned part to the SQL Standard, which allows a read-only graph query to be called inside a SQL SELECT statement, matching a graph pattern using syntax which is very close to Cypher, PGQL and G-CORE, and returning a table of data values as the result. SQL/PGQ also contains DDL to allow SQL tables to be mapped to a graph view schema object with nodes and edges associated to sets of labels and set of data properties.<ref name="SQL Part 16 PGQ">{{cite web|url=https://www.iso.org/standard/79473.html?browse=tc|title=ISO/IEC WD 9075-16 Information technology — Database languages SQL — Part 16: SQL Property Graph Queries (SQL/PGQ)|last=|first=|date=|website=|publisher=ISO|accessdate=October 6, 2019}}</ref><ref name="W3C Berlin SQL and GQL">{{cite web|url=https://www.w3.org/Data/events/data-ws-2019/assets/slides/KeithWHare-2.pdf||title=''SQL and GQL'', W3C Workshop on Web Standardization for Graph Data. Creating Bridges: RDF, Property Graph and SQL|last=Hare|first=Keith|display-authors=etal|date=|website=|publisher=W3C|accessdate=October 6, 2019}}</ref><ref name="LDBC SQL/PGQ">{{cite web|url=http://wiki.ldbcouncil.org/download/attachments/106233859/ldbc_tuc_2019_sql-pgq.pdf?version=1&modificationDate=1562342465000&api=v2|title=''Property graph extensions for the SQL standard''. LDBC 12th TUC.|last=Trigonakis|first=Vasileios|date=|website=|publisher=LBDC|accessdate=October 6, 2019}}</ref>
=== Cypher 9 ===
| |||