In GQL, single-line comments are written using either two forward slashes // or two minus signs --. Everything following // or -- on the same line is treated as a comment and ignored during query execution.
GQLMATCH (:User {name: "rowlock"})-[:Follows]->(n:User) // Retrieves users followed by rowlock RETURN n.name
A path expression should not juxtapose a token that exposes a minus sign on the right (]-, <-, -) followed by a token that exposes a minus sign on the left (-[, ->, -), as this combination introduces the comment symbol --.
This query throws syntax error since it concatenates <- and - without any separators:
GQL - Syntax ErrorMATCH (:User {name: "rowlock"})<--(n:User) RETURN n
Instead, you can use a space between the two abbreviated edge patterns:
GQLMATCH (:User {name: "rowlock"})<- -(n:User) RETURN n
Multi-line comments begin with a forward slash and asterisk (/*) and end with an asterisk and forward slash (*/), allowing for comments that span multiple lines.
GQL/* This query retrieves users followed by rowlock, and returns all their names */ MATCH (:User {name: "rowlock"})-[:Follows]->(n:User) RETURN n.name
