RQL: a view written as a sentence — It helps as you type

Completion only ever offers what can come next: a field's own operators, a choice field's actual options, and only the fields you can see. Names are written as text but held as the fields underneath, so renaming a field re-prints every statement that mentions it rather than breaking it. Under the box it tells you what will happen when the statement runs — how many of its conditions the database will apply, and anything that will be sampled rather than counted exactly — before you press Apply, rather than after.