Table: supercomputing_center
Columns: model_computer_name
cpu_type
no_of_processors
period_of_operation
maximum_peak_performance_teraflops
use

Question: Name the use for amd opteron dual-core 2.6ghz
SQL: SELECT "use" FROM supercomputing_center WHERE "cpu_type" = 'AMD Opteron dual-core 2.6GHz'

Question: Name the number of processors for nec sx-4 vector processor
SQL: SELECT "no_of_processors" FROM supercomputing_center WHERE "cpu_type" = 'NEC SX-4 vector processor'

Question: Name the most peak performance for october 2006 - january 2010
SQL: SELECT "maximum_peak_performance_teraflops" FROM supercomputing_center WHERE "period_of_operation" = 'October 2006 - January 2010'

Question: Name the cpu type for  june 2005 - april 2009
SQL: SELECT "cpu_type" FROM supercomputing_center WHERE "period_of_operation" = 'June 2005 - April 2009'

Question: Name the total number of model for amd opteron dual-core 2.6ghz
SQL: SELECT COUNT("model_computer_name") FROM supercomputing_center WHERE "cpu_type" = 'AMD Opteron dual-core 2.6GHz'

Question: Name the number of processors for october 2006 - january 2010
SQL: SELECT "no_of_processors" FROM supercomputing_center WHERE "period_of_operation" = 'October 2006 - January 2010'