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Heng Xing Tian Tai Lab of Xi'an City (abbr, HXTT)

improve the select query performance
2008-09-26 02:18:03.0
i am using the hxtt drive to read records from CSV;i just need to use select operation;how can i write select operations which is not time consuming in case of large number of rows ;i also need a record count every time and i want all this within a single result set.
for example:i have written one query
select mainCSV.*,hdrCSV.*,( select count('*') from templet.txt) as recordcount
from templet mainCSV
right join header hdrCSV

how can i modify this query in order to improve its performance it takes 16 sec for total of 50,000 rows
Re:improve the select query performance
HXTT Support
2008-09-26 02:34:12.0
select mainCSV.*,hdrCSV.*,(select top1 reccount('templet') from templet ) as recordcount
from templet mainCSV,header hdrCSV

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