?????? does copy command will clear all the old data?

[Peng Xiao]

Thanks Nandan for the confirmation.I also did the test.




------------------ ???????? ------------------
??????: "@Nandan@"<nandanpriyadarshi...@gmail.com>;
????????: 2018??2??13??(??????) ????12:52
??????: "user"<user@cassandra.apache.org>;

????: Re: does copy command will clear all the old data?



Hi Peng,Copy command will append upsert all data [based on size] to your 
existing Cassandra table. Just for testing, I executed before for 500000 data 
by using COPY command into small cql table and it work very fine. 


Point to make sure :- Please check your primary key before play with COPY 
command. 


Thanks 




On Tue, Feb 13, 2018 at 12:49 PM, Peng Xiao <2535...@qq.com> wrote:
Dear All,


I'm trying to import csv file to a table with copy command?The question is:
will the copy command clear all the old data in this table?as we only want to 
append the csv file to this table


Thanks