Expressions

Operators

=  !=  <>  <  >  <=  >=  AND  OR  NOT  +  -  *  /

!= and <> are equivalent inequality operators.

Literals

• Numbers: 500, 1.5
• Strings: "New Office Name"
• Attribute references: bare (id), or scoped (good.id, office.total)

Dynamic typing

Values are dynamically typed:

• Numeric semantics apply whenever both operands parse as numbers — good.cost * 2 does arithmetic if cost looks like a number.
• + on non-numeric operands concatenates as strings, instead of erroring.
• Missing attributes compare as false (SQL-NULL-ish) — this is what lets WHERE some_optional_attr > 5 silently skip elements that don't have some_optional_attr, rather than erroring. Use WHERE REQUIRED when a missing attribute should be a hard error instead.

Where expressions show up

• WHERE <expr> — must ultimately be truthy/falsy.
• SET v.attr = <expr> / MERGE v.attr = <expr> — the right-hand side.
• OUTPUT <expr> [AS name] — any expression, named with AS unless it's a bare attribute reference.