The following programs demonstrate the use of the ERASE statement
to delete records from a relation. These programs:
o Start a READ_WRITE transaction
o Find the records in COLLEGES with the college code "PURD"
o Delete those records from the COLLEGES relation
1 – C Example
#include <stdio.h>
DATABASE PERS = FILENAME "PERSONNEL";
main()
{
READY PERS;
START_TRANSACTION READ_WRITE;
FOR C IN COLLEGES WITH C.COLLEGE_CODE = "PURD"
ERASE C;
END_FOR;
ROLLBACK;
FINISH;
}
2 – Pascal Example
program erase_record (input,output);
DATABASE PERS = FILENAME 'PERSONNEL';
begin
READY PERS;
START_TRANSACTION READ_WRITE;
FOR C IN COLLEGES WITH C.COLLEGE_CODE = 'PURD'
ERASE C;
END_FOR;
ROLLBACK;
FINISH;
end.