Question

observe the hometown realestate database: seller sellerid sellername realtorid s111 paul r1 s222 carly r1 s333 ana r2 s444 charlotte r2 s555 aidan r3 c666 eric r1 c777 christina r1 realtor realtorid realtorname r1 claire r2 kate r3 cliff r4 william if a dbms enforces an update set-to-null 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 update the realtorid value in third record in table realtor from r3 to r5?

Answer 1

Enforcing an update set-to-null option on the referential integrity constraint between "seller" and "realtor" in the Hometown Real Estate database results in the "realtorid" of records s444 and s555 being set to null after updating the "realtorid" of realtor r3 to r5.

If a DBMS enforces an update set-to-null option on the referential integrity constraint between the "seller" and "realtor" tables in the Hometown Real Estate database, attempting to update the "realtorid" value in the third record of the "realtor" table from 'r3' to 'r5' will result in the corresponding "seller" records that reference 'r3' having their "realtorid" set to null.

This action maintains referential integrity by handling the update in a way that reflects the enforced set-to-null option. The "seller" records referencing 'r3' (s555 and s444) will have their "realtorid" set to null after the update.