16.2. Expressions

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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