Couchbase N1QL使用子查询更新文档

我正在尝试对一个“国家”文档进行非规范化，其中“regionName”字段对应于另一个“Region”文档的“name”。我的N1QL查询如下所示，但它不起作用

update test as t1 set regionName = (
 select raw name from test as t2 where `_class`="Region"
) where `_class`="Country" and t1.regionCode=t2.code RETURNING *;

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有什么帮助吗？

N1QL没有更新联接。不能在UPDATE WHERE子句中使用SET子句子查询源

使用合并

MERGE test AS m 
USING test AS s
ON s.`_class`="Region" AND m.`_class`="Country" AND m.regionCode=s.code
WHEN MATCHED THEN m.regionName = s.name;

CB 6.0

MERGE test AS m 
USING  (SELECT META(c).id, r.name
        FROM test AS r
        JOIN test AS c 
        ON r.`_class`="Region" AND c.`_class`="Country" 
           AND r.regionCode = c.code) AS s
ON KEY s.id
WHEN MATCHED THEN m.regionName = s.name;