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.