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Couchbase N1QL query with joined subquery with USE KEYS


By : zach
Date : September 16 2020, 06:00 AM
I think the issue was by ths following , Non FROM CLAUSE, correlated sub queries requires USE KEYS due to global secondary indexes queries can take long time and resources. This is restriction at present in the N1QL. If you can derive p's document key from the m you can give that as USE KEYS in p.
Otherwise you have two options
code :
SELECT META(m).id AS _ID, META(m).cas AS _CAS, c.description
FROM bucketName AS m
LEFT JOIN bucketName AS p ON p.masterId=m.masterId AND p.type='product'
LEFT JOIN bucketName AS c ON c.type='category' AND p.categoryId = c.categoryId
WHERE m.type='master' AND m.caseId='12345';

CREATE INDEX ix1 ON (caseId) WHERE type='master';
CREATE INDEX ix2 ON (masterId, categoryId) WHERE type='product';
CREATE INDEX ix3 ON (categoryId, description) WHERE type='category';

NOTE: If there is no Unique relation m to p to c JOIN can produce more results. 
If that is case, you can do GROUP BY META(m).id, META(m).cas and 
ARRAY_AGG(c.description). All descriptions are given as ARRAY.


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Couchbase N1QL combine subquery results


By : Dileep Hegde
Date : March 29 2020, 07:55 AM
like below fixes the issue I run three different N1QL query and it result look like below , You can combine subquery results with Couchbase 4.5.1.
code :
SELECT OBJECT_CONCAT( (subquery1)[0], (subquery2)[0], (subquery3)[0] );

Using IN clause in couchbase N1Ql @query or use findAll(keys) from couchbase JPA


By : zq azv
Date : March 29 2020, 07:55 AM
I hope this helps . Try adding both @N1qlPrimaryIndexed and @ViewIndexed annotations, like in the following example:
code :
@N1qlPrimaryIndexed
@ViewIndexed(designDoc = "businessUnity")
public interface BusinessUnityRepository extends CouchbaseRepository<BusinessUnity, String>{

List<BusinessUnity> findByCompanyId(String companyId);

}

Couchbase N1QL query aggregation


By : heyy tommy
Date : March 29 2020, 07:55 AM
To fix this issue SQL standards doesn't allow nested aggregates you need intervening subquery with multi level aggregates.
code :
SELECT d1.clientId,
       SUM(d1.serviceTotalVolume) AS totalVolume,
       SUM(d1.serviceTotalSize) AS totalSize,
       ARRAY_AGG({d1.serviceId, d1.serviceTotalVolume, d1.serviceTotalSize}) AS serviceSummary
FROM ( SELECT
             d.clientId,
             h.serviceId,
             COUNT(1) AS serviceTotalVolume,
             SUM(d.event.size) AS serviceTotalSize
       FROM demo AS d
       UNNEST d.event.history AS h
       WHERE h.code = 'SUCCESS'
       GROUP BY d.clientId, h.serviceId) AS d1
GROUP BY d1.clientId;

Get all unique keys from object of objects using N1QL in Couchbase


By : user2929107
Date : March 29 2020, 07:55 AM
hop of those help? If I have documents in Couchbase which all have a property foo which is an object of objects (all bars) like this: , UNNEST the Array
code :
   SELECT DISTINCT RAW n
   FROM default d
   UNNEST OBJECT_NAMES(d.foo) AS n;

Couchbase N1QL: How to aggregate and join from the same bucket with an array of keys


By : Bappi
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Use the NEST clause to output the photos array in the result document.
Example : (I use type to filter on your document type but it's perhaps not your case)
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