我有如下代碼。 from uuid import uuid4
from uuid import uuid1
from cassandra.cqlengine import columns, connection
from cassandra.cqlengine.models import Model
from cassandra.cqlengine.management import s
在幾個地方,建議根據我們要對它們執行的查詢來設計我們的卡桑德拉表。在this article by DataScale他們說明這一點: The truth is that having many similar tables with similar data is a good thing in Cassandra. Limit the primary key to exactly what y
我已經能夠得到時間序列表中的最後一行是: SELECT * from myapp.locations WHERE organization_id=1 and user_id=15 and date='2017-2-22' ORDER BY unix_time DESC LIMIT 1;
但是這工作正常,我想知道有關性能和執行ORDER BY的開銷行已經排序,我只是用它得到最後一行,在我的情況下
我想使用Python將Cassandra表導出爲CSV格式。但我做不到。不過,我可以從Python執行'select'語句。我已經使用了以下代碼: from cassandra.cluster import Cluster
cluster = Cluster()
session = cluster.connect('chandan') ### 'chandan' is the name of