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In this case, that'd be 23b0dc60-e5db-11e5-a4ba-a52893cc9f36: > SELECT datebucket, record_id, dateof(record_id), nameįROm employee_updates WHERE datebucket='20160309'ĪND record_id < 23b0dc60-e5db-11e5-a4ba-a52893cc9f36 LIMIT 3 ĭatebucket | record_id | system.If you’re apartment hunting, you may have compared the costs to rent one-bedroom and two-bedroom apartment units and wondered how anyone starting out can afford them. Now let me SELECT the top 3 most-recent for today: > SELECT datebucket, record_id, dateof(record_id), nameįROm employee_updates WHERE datebucket='20160309' LIMIT 3 ĭatebucket | record_id | system.dateof(record_id) | name > INSERT INTO employee_updates (datebucket, record_id, address, name ) VALUES ('20160309',now(),'43 Solid Rocket pl.','Helcine Kerman') > INSERT INTO employee_updates (datebucket, record_id, address, name ) VALUES ('20160309',now(),'33476 Booster way','Isabella Kerman') > INSERT INTO employee_updates (datebucket, record_id, address, name ) VALUES ('20160309',now(),'843 Rocket dr.','Valentina Kerman') > INSERT INTO employee_updates (datebucket, record_id, address, name ) VALUES ('20160309',now(),'34534 Water st.','Jebediah Kerman') > INSERT INTO employee_updates (datebucket, record_id, address, name ) VALUES ('20160309',now(),'456 Gene ave.','Bill Kerman') Let's insert some rows into your table: > INSERT INTO employee_updates (datebucket, record_id, address, name ) VALUES ('20160309',now(),'123 main st.','Bob Kerman') This solution actually does have a way to "page" through the results. What if i want to previous latest 100 record that is 801 to 900
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Note: If "day" is too granular for your solution (only a few employee records get updated each day) then feel free to widen that to something more applicable. You can get the most-recent 100 records for that particular day.
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Now when you query this table for the last 100 records: SELECT * FROM employee_udpates WHERE datebucket='20160309' LIMIT 100 WITH CLUSTERING ORDER BY (record_id DESC) I would create a specific table to serve that: CREATE TABLE employee_updates ( What I'm hearing, is that you want to retrieve the last 100 updated employees. In Cassandra you need to design your tables to fit your query patterns.
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As Stefan suggested, a TimeUUID offers a way around this problem. Now you have two rows being inserted with 2545, and in Cassandra, the last write "wins" so you'll lose the first write.Ĭonsequently, this is also why read-before-write approaches are considered anti-patterns in Cassandra. Before that new row can be written, the other node does the same process, and also gets 2544. One checks the table for the max ID, and gets a (example) response of 2544. Two nodes get write requests to the same table at the same time. Why? Let's say that you have three nodes. Auto-increment IDs don't really work in Cassandra or any other distributed database.