qu.9

linux 下用c++ 开发的一个小型数据库系统

/*
 * test 9 tests QU_Join with large relations
 */

/* create relations */
create table rel500 (unique1 int, unique2 int, hundred1 int, hundred2 int, dummy char(84));
load table rel500 from ("../data/rel500.data");

create table rel1000 (unique1 int, unique2 int, hundred1 int, hundred2 int, dummy char(84));
load table rel1000 from ("../data/rel1000.data");

/* create indices */
/*
buildindex rel500(unique2);
buildindex rel500(hundred2);
buildindex rel1000(unique2);
buildindex rel1000(hundred2);
*/

/* join queries */
Select rel500.dummy, rel500.unique1, rel1000.dummy into temprel 
from rel500,rel1000
where rel500.unique1 = rel1000.unique1;
help table temprel;
destroy table temprel;

Select rel500.dummy, rel500.unique2, rel1000.dummy into temprel 
from rel500,rel1000
where rel500.unique2 = rel1000.unique2;
help table temprel;
destroy table temprel;

Select rel500.dummy, rel500.unique1, rel1000.dummy into temprel 
from rel500,rel1000
where rel500.unique1 = rel1000.unique2;
help table temprel;
destroy table temprel;

Select rel500.dummy, rel500.unique2, rel1000.dummy into temprel
from rel500,rel1000 
where rel500.unique2 = rel1000.unique1;
help table temprel;
destroy table temprel;

Select rel500.dummy, rel500.unique1, rel1000.dummy into temprel 
from rel500, rel1000
where rel500.unique1 = rel1000.hundred1;
help table temprel;
destroy table temprel;

Select rel500.dummy, rel500.unique1, rel1000.dummy into temprel 
from rel500,rel1000
where rel500.unique1 = rel1000.hundred2;
help table temprel;
destroy table temprel;