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How to subset the extremly large dataset?

Dear all;
I have a extremly large tick by tick dataset. I used the proc sql process as following:
(proc sql noprint;
select distinct clientid
into :client1-:client60000 from largedataset;
quit;)
that is, I used the proc sql process to generate 60,000 marco variables for each clientid. Now I want to delete the records for client1-client20000,and keep other 40,000 clients' record. How can do it efficiently? Thanks!
Liu Feng

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