LIMIT clause
TheLIMIT
clause specifies the maximum number of documents to be returned in a resultset by aSELECT
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 .
|
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" } ]