11.2. Expressions

Prev		Next

An expression in Cypher can be:

A numeric literal (integer or double): 13, 40000, 3.14.
A string literal: "Hello", 'World'.
A boolean literal: true, false, TRUE, FALSE.
An identifier: n, x, rel, myFancyIdentifier, `A name with weird stuff in it[]!`.
A property: n.prop, x.prop, rel.thisProperty, myFancyIdentifier.`(weird property name)`.
A nullable property: it’s a property, with a question mark or exclamation mark — n.prop?, rel.thisProperty!.
A parameter: {param}, {0}
A collection of expressions: ["a", "b"], [1,2,3], ["a", 2, n.property, {param}], [ ].
A function call: length(p), nodes(p).
An aggregate function: avg(x.prop), count(*).
Relationship types: :REL_TYPE, :`REL TYPE`, :REL1|REL2.
A path-pattern: a-->()<--b.
A predicate expression is an expression that returns true or false: a.prop = "Hello", length(p) > 10, has(a.name)

String literals can contain these escape sequences.