What constraint of instructor $($see Fig. $2\mathrm{.}4)$ is violated if we delete the tuple $($Music$,$

Packard, $80000)$ from department in Fig $2\mathrm{.}4)$

ID

name

dept

name

salary

$222221212132343455659834576766101015858383821151513345676543$

Einstein Wu

El Said Katz

Kim Crick Srinivasan Califieri Brandt Mozart Gold Singh

Physics Finance History Comp. Sci. Elec. Eng. Biology Comp. Sci. History Comp. Sci. Music Physics Finance

$950009000060000750008000072000650006200092000400008700080000$

$($Figure $2\mathrm{.}4$ Unsorted display of the instructor relation.$)$

dept name

building

budget

Biology Comp. Sci. Elec. Eng. Finance History Music Physics

Watson Taylor Taylor Painter Painter Packard Watson

$9000010000085000120000500008000070000$

$($Figure $2\mathrm{.}5$ The department relation.$)$