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LIMIT
The LIMIT
statement allows slicing the result array using an
offset and a count. It reduces the number of elements in the result to at most
the specified number.
Syntax
Two general forms of LIMIT
are:
LIMIT count
LIMIT offset, count
The first form allows specifying only the count
value whereas the second form
allows specifying both offset
and count
. The first form is identical using
the second form with an offset
value of 0
.
Usage
FOR u IN users
LIMIT 5
RETURN u
Above query returns the first five documents of the users
collection.
It could also be written as LIMIT 0, 5
for the same result.
Which documents it actually returns is rather arbitrary, because no explicit
sorting order is specified however. Therefore, a limit should be usually
accompanied by a SORT
operation.
The offset
value specifies how many elements from the result shall be
skipped. It must be 0 or greater. The count
value specifies how many
elements should be at most included in the result.
FOR u IN users
SORT u.firstName, u.lastName, u.id DESC
LIMIT 2, 5
RETURN u
In above example, the documents of users
are sorted, the first two results
get skipped and it returns the next five user documents.
Variables, expressions and subqueries can not be used for offset
and count
. The values for offset
and count
must be known at query compile time, which means that you can only use number literals, bind parameters or expressions that can be resolved at query compile time.
Where a LIMIT
is used in relation to other operations in a query has meaning.
LIMIT
operations before FILTER
s in particular can change the result
significantly, because the operations are executed in the order in which they
are written in the query. See FILTER
for a detailed example.
The LIMIT
operation never applies to write operations (INSERT
, UPDATE
,
REPLACE
, REMOVE
, UPSERT
) but only their returned results. In the following
example, five documents are created, regardless of the LIMIT 2
. The LIMIT
operation only constrains the number of documents returned by the query (via
RETURN
) to the first two:
FOR i IN 1..5
INSERT { value: i } INTO coll
LIMIT 2
RETURN NEW