$4\mathrm{.}11$ Design a relational database schema for the data about the

automobile repair shop described in Exercise $3\mathrm{.}7.$

$4\mathrm{.}12$ Design a relational database schema for the data about the physical

therapy center described in Exercise $3\mathrm{.}8.$

Page $151,$ Chapter $4($The Relational Model$),$ Ex$.4\mathrm{.}11$ y $4\mathrm{.}12-$Database Illuminated $3$th Edition