If a DBMS enforces a DELETE RESTRICT option on the referential integrity constraint between SELLER and REALTOR in the HOMETOWN REALESTATE database, what will be the outcome after a user tries to delete the last record (R4, William) from REALTOR?

Given the following Relations in a DBMS write the output of the queries, in tuple form with attribute labels. EMPLOYEE Sex Salary Super_ssn Dno 123456789 1965-01-09 731 Fondren, Houston, TX M 30000 333445555 Fname Minit Lname Ssn Bdate Address John в Smith Franklin T 333445555 1955-12-08 638 Voss, Houston, TX 999887777 1968-01-19 3321 Castle, Spring, TX Wallace 987654321 1941-06-20 291 Borry, Bollaire, TX Narayan 666884444 1962-09-15 975 Fire Oak, Humble, TX M English 453453453 1972-07-31 5631 Rice, Houston, TX 40000 888665555 25000 987654321 43000 888665555 Wong M Alicia Zelaya Jennifer F 4 Ramesh K 38000 333445555 Joyce A F 25000 333445555 Ahmad V Jabbar 987987987 1969-03-29 980 Dallas, Houston, TX M 25000 987654321 4 E Borg 55000 NULL James 888665555 1937-11-10 450 Stone, Houston, TX M 1 DEPARTMENT DEPT_LOCATIONS Dnumber Mgr_ssn Dname Rosearch Mgr_start_date Dlocation Dnumber 333445555 1988-05-22 Houston Administration 4 987654321 1995-01-01 4 Stafford Headquarters 1 888665555…

How does the foreign key contribute to the security of a database? Do you want to do this for a certain reason?

Is it possible for a user's effort at adding data to the database to result in the creation of a record that breaks an enabled constraint?