QUESTION $11.$ Get all pairs of city names such that a supplier in the first city supplies a job in the second city

Suppliers$-$Parts$-$Jobs $($SPJ$)$ Database Practice Queries

Consider the following relational database about suppliers, parts, and jobs.

$P(\frac{P}{\text{\#}},$ PName, Color, City $)$

$J(\frac{J}{\text{\#}},$ JName, City $)$

$SPJ(\frac{S}{\text{\#}},\frac{P}{\text{\#}},$ #$,QTY)$

Suppliers $($S$),$ parts $($P$),$ and jobs $($J$)$ are uniquely identified by supplier number $($S#$),$ part number $($P#$),$ and

job number $($J#$),$ respectively. The significance of an SPJ $($shipment$)$ record is that the specified supplier

supplies the specified part to the specified job in the specified quantity $($and the combination S#$,$ P#$,$ J#

uniquely identifies such a record$).$ An instance of this database is given below.