LIMIT clause

The LIMIT clause specifies the maximum number of documents to be returned in a resultset by a SELECT statement.

(Introduced in Couchbase Server 4.0)

Purpose

When you don’t need the entire resultset, use the LIMIT clause to specify the maximum number of documents to be returned in a resultset by a SELECT query.

The LIMIT and OFFSET clauses are evaluated after the ORDER BY clause.

A negative value is the same as LIMIT 0.

Starting from version 4.5, the LIMIT clause in INSERT, UPDATE, and DELETE statements is no longer a hint. It indicates that the actual number of mutations will be less than or equal to the specified LIMIT.

Syntax

LIMIT expr

Arguments

expr: Integer or an expression that evaluates to an integer representing the number of resulting documents.

Examples

Example 1: Get only 2 documents of hotels with an empty room.

SELECT name, address, city, country, url
FROM `travel-sample`
WHERE type="hotel"
  AND vacancy = true
LIMIT 2;

Result:

[
  {
    "address": "Capstone Road, ME7 3JE",
    "city": "Medway",
    "country": "United Kingdom",
    "name": "Medway Youth Hostel",
    "url": "http://www.yha.org.uk"
  },
  {
    "address": "6 rue aux Juifs",
    "city": "Giverny",
    "country": "France",
    "name": "The Robins",
    "url": "http://givernyguesthouse.com/robin.htm"
  }
]

Example 2: Set the limit of Example 1 based on an equation.

SELECT name, address, city, country, url
FROM `travel-sample`
WHERE type="hotel"
  AND vacancy = true
LIMIT (20/10);

Result:

[
  {
    "address": "Capstone Road, ME7 3JE",
    "city": "Medway",
    "country": "United Kingdom",
    "name": "Medway Youth Hostel",
    "url": "http://www.yha.org.uk"
  },
  {
    "address": "6 rue aux Juifs",
    "city": "Giverny",
    "country": "France",
    "name": "The Robins",
    "url": "http://givernyguesthouse.com/robin.htm"
  }
]