Based on the request to modify the instructions and variable names in the provided database

schema and questions, l$\text{'}$ll rephrase them accordingly:

Consider the following adjusted schemas where primary keys are in bold. All properties are of

type string if not indicated otherwise. Use multi$-$step and multi$-$line queries to simplify the

construction of queries. Aggregate functions as defined in some resources are not used here,

as they are considered problematic extensions of the classical Relational Model. ONLY USE

RELATIONAL ALGEBRA. SQL INSTRUCTIONS ARE NOT ALLOWED!!!

People$($PersonID$,$ GivenName, Surname, BirthDate, Gender, MainPhysicianID$)$

MedExperts$($ExpertID$,$ GivenName, Surname, Field, HouseID, StartDate$)$

Houses$($HouseID$,$ Name, Location, StaffCount$)$

Caregivers$($CaregiverID$,$ GivenName, Surname, Schedule, HouseID, LeaderID$)$

Procedures$($ProcedureID$,$ Title, Details, Expense$)$

PersonProcedures$($PersonID$,$ ProcedureID, Date, ExpertID, CaregiverID$)$

Visits$($VisitID$,$ PersonID, ExpertID, Date, Hour, Intent$)$

HealthLogs$($LogID$,$ PersonID, Date, Overview, Condition, CarePlan$)$

Find the names of people who have received procedures in more than one house and list these

houses along with the names of the people.

Find the names of medexperts who have administered procedures to people whose given

names are PersonA or PersonB on November $11.$