qu.8

来自「linux 下用c++ 开发的一个小型数据库系统」· 8 代码 · 共 51 行

/*
 * test 8 tests QU_Delete with indices
 */


/* create the relations and indices */
create table soaps(soapid int, name char(28), network char(4), rating real);
/*
buildindex soaps(name);
buildindex soaps(network);
*/
load table soaps from ("../data/soaps.data");

create table stars(starid int, real_name char(20), plays char(12), soapid int);
/*
buildindex stars(real_name);
buildindex stars(soapid);
*/
load table stars from ("../data/stars.data");

print table stars;

/* John Novak is being written out of Santa Barbara */
delete from stars where stars.real_name = "Novak, John";

print table stars;

/* delete everyone on The Young and the Restless */
delete from stars where stars.soapid = 5;

select starid, real_name, plays, soapid from stars where soapid = 5;

print table stars;

print table soaps;

/* get rid of all soaps that aren't doing well in the ratings */
delete from soaps where soaps.rating < 6.0;


select soapid from soaps where rating = 6.0;

print table soaps;

/* cancel all the soaps and fire all of the stars */
delete from soaps;
delete from stars;

print table soaps;
print table stars;