❝s❝✸✹✸ ✇✐♥t❡r ✷✵✷✵ ❛ss✐❣♥♠❡♥t ★✸✿ ❞❛t❛❜❛s❡ ❞❡s✐❣♥ due March 30th, 4 p.m.
goals
❚❤✐s ❛ss✐❣♥♠❡♥t ❛✐♠s t♦ ❤❡❧♣ 2♦✉ ❧❡❛r♥ t♦✿
✎ ✐♥❢♦r♠❛❧❧2 ❞❡s✐❣♥ ❛ ❞❛t❛❜❛s❡ t♦ r❡♣r❡s❡♥t ❛ r❡❛❧✲✇♦r❧❞ s❝❡♥❛r✐♦ ✎ ❡1♣r❡ss 2♦✉r ❞❡s✐❣♥ ❛s ❛♥ ❙◗▲ s❝❤❡♠❛
✎ r❡❛s♦♥ ❛❜♦✉t ❢✉♥❝t✐♦♥❛❧ ❞❡♣❡♥❞❡♥❝✐❡s ❛♥❞ ✉s❡ ♥♦r♠❛❧ ❢♦r♠s
design context
❨♦✉ ❛r❡ ❤❡❧♣✐♥❣ ❞❡s✐❣♥ ❛ ❞❛t❛❜❛s❡ ❜❛❝❦✲❡♥❞ ❢♦r ❲❡t ❲♦r❧❞✬s ❞✐✈❡ ❜♦♦❦✐♥❣ ❛♣♣✳ ◗✉❛❧✐☞❡❞ ❞✐✈❡rs ✇✐❧❧ ✉s❡ t❤❡ ❛♣♣ t♦ ❜♦♦❦ ❞✐✈❡s ✇✐t❤ ❛ ❞✐✈❡ ♠♦♥✐t♦r ❛♥❞ ❞✐✈❡ s✐t❡✳
❉✐✈❡rs ♠✉st ❜❡ ❛t ❧❡❛st ✶✻ ✇❤❡♥ ❛ ❞✐✈❡ ♦❝❝✉rs ❛♥❞ ❤❛✈❡ ❛♥ ♦♣❡♥✲✇❛t❡r ❝❡rt✐☞❝❛t✐♦♥ ❢r♦♠ ♦♥❡ ♦❢✿ ◆❆❯■✱ ❈▼❆❙✱ ♦r P❆❉■✳ ❖♥❡ ❞✐✈❡r✱ t❤❡ ❭❧❡❛❞✱✧ ❜♦♦❦s ❛ ❞✐✈❡✱ ♣♦ss✐❜❧2 t♦ ✐♥❝❧✉❞❡ ♦t❤❡r q✉❛❧✐☞❡❞ ❞✐✈❡rs✱ ✉♣ t♦ t❤❡ ❧✐♠✐t t❤❡ ♠♦♥✐t♦r ✐s ✇✐❧❧✐♥❣ t♦ t❛❦❡✱ ❛♥❞ t❛❦✐♥❣ ✐♥t♦ ❛❝❝♦✉♥t t❤❡ ♥✉♠❜❡r t❤❡ ❞✐✈❡ s✐t❡ ❤❛s ❝❛♣❛❝✐t2 ❢♦r ❛t t❤❛t ❞❛t❡ ❛♥❞ t✐♠❡✳
❊❛❝❤ ♠♦♥✐t♦r ❤❛s t❤❡✐r ♦✇♥ ♣r✐❝❡ ❧✐st✱ ❛❝❝♦r❞✐♥❣ t♦ ✇❤❡t❤❡r ❛ ❞✐✈❡ ✇✐❧❧ ❜❡ ♠♦r♥✐♥❣ ✭✾✿✸✵ t♦ ✶✶ ❛✳♠✳✮✱ ❛❢t❡r♥♦♦♥ ✭✶✷✿✸✵ t♦ ✷ ♣✳♠✳✮ ♦r ♥✐❣❤t ✭✽✿✸✵ t♦ ✶✵ ♣✳♠✳✮✱ ❛♥❞ ✇❤❡t❤❡r t❤❡ ❞✐✈❡ ✇✐❧❧ ❜❡ ♦♣❡♥ ✇❛t❡r✱ ❝❛✈❡ ❞✐✈✐♥❣✱ ♦r ❞❡❡♣❡r t❤❛♥ ✸✵ ♠❡t❡rs✳ ❚❤❡ ♣r✐❝❡ ❝❤❛r❣❡❞ ❜2 ❛ ♠♦♥✐t♦r ✐♥❝❧✉❞❡s ❛♥2 ❢❡❡s ❛ ❞✐✈❡ s✐t❡ ❝❤❛r❣❡s ♣❡r ❞✐✈❡r✱ ❛♥❞ ❛ ♠♦♥✐t♦r ♠❛2 ❤❛✈❡ ❜♦♦❦✐♥❣ ♣r✐✈✐❧❡❣❡s ✇✐t❤ ♦♥❡ ♦r ♠♦r❡ ❞✐✈❡ s✐t❡s✳ ▼♦♥✐t♦rs ❛❧s♦ ❤❛✈❡ ❛ ♠❛1✐♠✉♠ ❣r♦✉♣ s✐3❡ ❢♦r ❡❛❝❤ ❝❛t❡❣♦r2✿ ♦♣❡♥ ✇❛t❡r✱ ❝❛✈❡✱ ♦r ❞❡❡♣❡r t❤❛♥ ✸✵ ♠❡t❡rs✱ ❛♥❞ t❤❡2 s❡t t❤❡ ♠❛1✐♠✉♠ t♦ ✵ ✐❢ t❤❡2 ❞♦ ♥♦t s✉♣❡r✈✐s❡ t❤❛t ❝❛t❡❣♦r2 ♦❢ ❞✐✈❡✳
❆❧❧ ❞✐✈❡ s✐t❡s ♣r♦✈✐❞❡ ✶✷ ❧✐tr❡ ❛❧✉♠✐♥✉♠ t❛♥❦s✱ ✇❡✐❣❤t ❜❡❧ts ❛♥❞ ❜♦✉2❛♥❝2 ❝♦♠♣❡♥s❛t✐♦♥ ✈❡sts ❛s ♣❛rt ♦❢ t❤❡✐r ❢❡❡✳ ❙♦♠❡ ❛❧s♦ ♣r♦✈✐❞❡ ♠❛s❦✱ r❡❣✉❧❛t♦r✱ ☞♥s✱ ❛♥❞ ✇r✐st✲♠♦✉♥t❡❞ ❞✐✈❡ ❝♦♠♣✉t❡r✱ ❡❛❝❤ ❢♦r ❛❞❞✐t✐♦♥❛❧ ❢❡❡s✳ ■♥ ❛❞❞✐t✐♦♥ s♦♠❡ s✐t❡s ♣r♦✈✐❞❡ ❢r❡❡ s❡r✈✐❝❡s ❢r♦♠ ❛♠♦♥❣✿ ✈✐❞❡♦ ♦❢ ❞✐✈❡s✱ s♥❛❝❦s✱ ❤♦t s❤♦✇❡rs✱ t♦✇❡❧ s❡r✈✐❝❡✳ ❊❛❝❤ s✐t❡ ❧✐sts ❛ ♠❛1✐♠✉♠ ♥✉♠❜❡r ♦❢ ❞✐✈❡rs✱ ❝♦♠❜✐♥✐♥❣ ♦♥❡ ♦r ♠♦r❡ ❜♦♦❦✐♥❣s✱ ❛❧❧♦✇❡❞ ♦♥ s✐t❡ ❛t ❛♥2 ❞❛2❧✐❣❤t ❤♦✉r✱ ❛♥❞ ❧✐sts s♠❛❧❧❡r ♠❛1✐♠❛ ❢♦r ♥✐❣❤t✱ ❝❛✈❡✱ ♦r ❞❡❡♣❡r t❤❛♥ ✸✵ ♠❡t❡r ❞✐✈❡s✳ ❊❛❝❤ s✐t❡ ❧✐sts ♦♥❡ ♦r ♠♦r❡ ❞✐✈❡ t2♣❡s t❤❡2 ♣r♦✈✐❞❡ ❢r♦♠✿ ♦♣❡♥ ✇❛t❡r✱ ❝❛✈❡ ❞✐✈❡✱ ♦r ❜❡2♦♥❞ ✸✵ ♠❡t❡rs✳
❆ ❧❡❛❞ ❞✐✈❡r ♠❛2 ❜♦♦❦ ❛s ♠❛♥2 ❞✐✈❡s ❛s t❤❡2 ❝❛♥ ☞♥❞ ♠♦♥✐t♦rs ❛♥❞ ❞✐✈❡ s✐t❡s ❢♦r✱ ❜✉t ♦♥❧2 ♦♥❡ ❞✐✈❡ ❛t ❛ ❣✐✈❡♥ ❞❛t❡ ❛♥❞ t✐♠❡✳ ◆♦ ♠♦♥✐t♦r ✐s ❛❧❧♦✇❡❞ t♦ ❜♦♦❦ ♠♦r❡ t❤❛♥ t✇♦ ❞✐✈❡s ♣❡r ✷✹ ❤♦✉r ♣❡r✐♦❞✱ ✐♥ ♦r❞❡r t♦ ❦❡❡♣ t❤❡✐r ❜❧♦♦❞ ♥✐tr♦❣❡♥ ❛t s❛❢❡ ❧❡✈❡❧s✳ ❚❤❡ ❧❡❛❞ ❞✐✈❡r ♣r♦✈✐❞❡s ❝r❡❞✐t ❝❛r❞ ✐♥❢♦r♠❛t✐♦♥✱ ❡♠❛✐❧ ❛❞❞r❡ss❡s ❛♥❞ ❞✐✈❡ ❝❡rt✐☞❝❛t✐♦♥ ❢♦r ❛❧❧ ❞✐✈❡rs✱ ❛♥❞ ❝r❡❞✐t ❝❛r❞ ✐♥❢♦r♠❛t✐♦♥ t♦ s❡❝✉r❡ t❤❡ ❞✐✈❡✭s✮✳
❆❧❧ ❞✐✈❡rs ♠❛2✱ ♦♣t✐♦♥❛❧❧2✱ r❛t❡ ❛ s✐t❡ ♦♥ ❛ s❝❛❧❡ ♦❢ ✵ ✭✈❡r2 ♣♦♦r✮ t♦ ✺ ✭❡1❝❡❧❧❡♥t✮✱ ❛♥❞ ❧❡❛❞ ❞✐✈❡rs ♠❛2 r❛t❡ ♠♦♥✐t♦rs ♦♥ t❤❡ s❛♠❡ s❝❛❧❡✳
✶
schema
❉❡☞♥❡ ❛ s❝❤❡♠❛ ✐♥ ❉❉▲✱ st♦r❡❞ ✐♥ ☞❧❡ schema.ddl✳ ❨♦✉r ❣♦❛❧s✱ ✐♥ ♣r✐♦r✐t2 ♦r❞❡r✱ ❛r❡✿
✶✳ ❆❧❧♦✇ ❛s ❢❡✇ r❡❞✉♥❞❛♥❝✐❡s ❛s ♣♦ss✐❜❧❡✳
✷✳ ❆❧❧♦✇ ❛s ❢❡✇ ◆❯▲▲ ♦r ❉❊❋❆❯▲❚ ✈❛❧✉❡s ❛s ♣♦ss✐❜❧❡✳
✸✳ ❲✐t❤♦✉t ✉s✐♥❣ ❛ss❡rt✐♦♥s ♦r tr✐❣❣❡rs✱ ❡♥❢♦r❝❡ ❛s ♠❛♥2 ❝♦♥str❛✐♥ts ❢r♦♠ t❤❡ ❞❛t❛❜❛s❡ ❞❡s❝r✐♣t✐♦♥ ❛s 2♦✉ ❝❛♥✳
❲❤❡r❡✈❡r ❣♦❛❧s ❛r❡ ✐♥ ❝♦♥✌✐❝t✱ ✐♠♣❧❡♠❡♥t t❤❡ ❤✐❣❤❡r✲♣r✐♦r✐t2 ❣♦❛❧✳ ❆❧s♦ 2♦✉ s❤♦✉❧❞✿
✎ ❉❡☞♥❡ ❛ ♣r✐♠❛r2 ❦❡2 ❢♦r ❡❛❝❤ t❛❜❧❡✱ ❛♥❞ ✐♥ ❛❞❞✐t✐♦♥ ✉s❡ ❯◆■◗❯❊ ❛♥❞ ❞❡☞♥❡ ❢♦r❡✐❣♥ ❦❡2s ✇❤❡r❡ ❛♣♣r♦♣✐❛t❡✳
❨♦✉ ✇✐❧❧ ❜❡ r❡♣❡❛t❡❞❧2 r❡✲✐♠♣♦rt✐♥❣ schema.ddl ❛s 2♦✉ ❞❡✈❡❧♦♣ ❛♥❞ t❡st ✐t✱ s♦ ✐t s❤♦✉❧❞ ❜❡❣✐♥ ✇✐t❤ t❤❡ ❢♦❧❧♦✇✐♥❣✿
drop schema if exists wetworldschema cascade;
create schema wetworldschema;
set search_path to wetworldschema;
❆t t❤❡ t♦♣ ♦❢ schema.ddl ✉s❡ ❛ ❝♦♠♠❡♥t t♦ ❞♦❝✉♠❡♥t ✇❤✐❝❤ ❝♦♥str❛✐♥ts ❝♦✉❧❞ ♥♦t ❜❡ ❡♥❢♦r❝❡❞✱ ❛♥❞ ✇❤✐❝❤ 2♦✉ ❝❤♦s❡ ♥♦t t♦ ❡♥❢♦r❝❡✱ ❛♥❞ ✇❤2✳ ❲❡ ✇✐❧❧ ❛❧s♦ ♣r♦✈✐❞❡ ❛ ❞❛t❛✳t1t ☞❧❡ ✇✐t❤ ❛ ♣❧❛✐♥ t❡1t ❞❡s❝r✐♣t✐♦♥ ♦❢ ❛ ❞❛t❛❜❛s❡✳
some queries
❆❢t❡r 2♦✉ ❤❛✈❡ ☞♥✐s❤❡❞ schema.ddl ❞❡☞♥❡ ❛ ♥❡✇ ☞❧❡ data.sql t♦ ♣♦♣✉❧❛t❡ ❛♥ ✐♥st❛♥❝❡ ♦❢ 2♦✉r ❞❛t❛❜❛s❡ ✇✐t❤ s❛♠♣❧❡ ❞❛t❛✳ ❲❡ ✇✐❧❧ ♥♦t ❜❡ ❛✉t♦t❡st✐♥❣ t❤✐s✱ s♦ 2♦✉ ❣❡t t♦ ❞❡❝✐❞❡ ♦♥ t❛❜❧❡ str✉❝t✉r❡ ❛♥❞ ❛ttr✐❜✉t❡ ♥❛♠❡s ❛s 2♦✉ ❧✐❦❡✳ ❲r✐t❡ q✉❡r✐❡s ❢♦r t❤❡ ❢♦❧❧♦✇✐♥❣✿
✶✳ ❋♦r ❡❛❝❤ ❞✐✈❡ ❝❛t❡❣♦r2 ❢r♦♠ ♦♣❡♥ ✇❛t❡r✱ ❝❛✈❡✱ ♦r ❜❡2♦♥❞ ✸✵ ♠❡t❡rs✱ ❧✐st t❤❡ ♥✉♠❜❡r ♦❢ ❞✐✈❡ s✐t❡s t❤❛t ♣r♦✈✐❞❡ t❤❛t ❞✐✈❡ t2♣❡ ❛♥❞ ❤❛✈❡ ❛t ❧❡❛st ♦♥❡ ♠♦♥✐t♦r ✇✐t❤ ❜♦♦❦✐♥❣ ♣r✐✈✐❧❡❣❡s ✇✐t❤ t❤❡♠ ✇❤♦ ✇✐❧❧ s✉♣❡r✈✐s❡ ❣r♦✉♣s ❢♦r t❤❛t t2♣❡ ♦❢ ❞✐✈❡✳
✷✳ ❋✐♥❞ ♠♦♥✐t♦rs ✇❤♦s❡ ❛✈❡r❛❣❡ r❛t✐♥❣ ✐s ❤✐❣❤❡r t❤❛♥ t❤❛t ♦❢ ❛❧❧ ❞✐✈❡s s✐t❡s t❤❛t t❤❡ ♠♦♥✐t♦r ✉s❡s✳ ❘❡♣♦rt ❡❛❝❤ ♦❢ t❤❡s❡ ♠♦♥✐t♦r✬s ❛✈❡r❛❣❡ ❜♦♦❦✐♥❣ ❢❡❡ ❛♥❞ ❡♠❛✐❧✳
✸✳ ❋✐♥❞ t❤❡ ❛✈❡r❛❣❡ ❢❡❡ ❝❤❛r❣❡❞ ♣❡r ❞✐✈❡ ✭✐♥❝❧✉❞✐♥❣ ❡1tr❛ ❝❤❛r❣❡s✮ ❢♦r ❞✐✈❡ s✐t❡s t❤❛t ❛r❡ ♠♦r❡ t❤❛♥ ❤❛❧❢ ❢✉❧❧ ♦♥ ❛✈❡r❛❣❡✱ ❛♥❞ ❢♦r t❤♦s❡ t❤❛t ❛r❡ ❤❛❧❢ ❢✉❧❧ ♦r ❧❡ss ♦♥ ❛✈❡r❛❣❡✳ ❈♦♥s✐❞❡r ❜♦t❤ ✇❡❡❦❞❛2s ❛♥❞ ✇❡❡❦❡♥❞s ❢♦r ✇❤✐❝❤ t❤❡r❡ ✐s ❜♦♦❦✐♥❣ ✐♥❢♦r♠❛t✐♦♥✳ ❈❛♣❛❝✐t2 ✐♥❝❧✉❞❡s ❛❧❧ ❞✐✈❡rs✱ ✐♥❝❧✉❞✐♥❣ ♠♦♥✐t♦rs✱ ❛t ❛ s✐t❡ ❛t ❛ ♠♦r♥✐♥❣✱ ❛❢t❡r♥♦♦♥✱ ♦r ♥✐❣❤t ❞✐✈❡ ♦♣♣♦rt✉♥✐t2✳
✹✳ ❋♦r ❡❛❝❤ ❞✐✈❡ s✐t❡ r❡♣♦rt t❤❡ ❤✐❣❤❡st✱ ❧♦✇❡st✱ ❛♥❞ ❛✈❡r❛❣❡ ❢❡❡ ❝❤❛r❣❡❞ ♣❡r ❞✐✈❡✳ ◗✉❡r✐❡s ❛r❡ st♦r❡❞ ✐♥ ☞❧❡s q1.sql, q2.sql, q3.sql, ❛♥❞ q4.sql✳
✷
dependencies, decompositions, normal forms
■♥ ☞❧❡ dependencies.pdf r❡♣♦rt t❤❡ ❢♦❧❧♦✇✐♥❣✿
✶✳ ❘❡❧❛t✐♦♥ ❘ ❤❛s ❛ttr✐❜✉t❡s ■❏❑▲▼◆❖P ❛♥❞ ❢✉♥❝t✐♦♥❛❧ ❞❡♣❡♥❞❡♥❝✐❡s✿
❙P ❂❢▼ ✦■❏▲❀❏ ✦▲■❀❏◆ ✦❑▼❀▼ ✦❏❀❑▲◆ ✦▼❀❑ ✦■❏▲❀■❏ ✦❑❣
✭❛✮ ❋✐♥❞ ❛ ♠✐♥✐♠❛❧ ❜❛s✐s ❢♦r ❘✳ ▲✐st t❤❡ ❛ttr✐❜✉t❡s ✐♥ ❡❛❝❤ ▲❍❙ ✐♥ ❛❧♣❤❛❜❡t✐❝❛❧ ♦r❞❡r✱ ❡❛❝❤ ❘❍❙ ✐♥ ❛❧♣❤❛❜❡t✐❝❛❧ ♦r❞❡r✱ ❛♥❞ 2♦✉r ❡♥t✐r❡ s❡t ❋❉s ✐♥ ❛❧♣❤❛❜❡t✐❝❛❧ ♦r❞❡r✳
✭❜✮ ❋✐♥❞ ❛❧❧ ❦❡2s ❢♦r ❘✳
✭❝✮ ❯s❡s ✸◆❋ t♦ ☞♥❞ ❛ ❧♦ss❧❡ss✱ ❞❡♣❡♥❞❡♥❝2✲♣r❡s❡r✈✐♥❣ ❞❡❝♦♠♣♦s✐t✐♦♥ ♦❢ ❘✳ ❇❡ s✉r❡ t♦ ❝♦♠❜✐♥❡ ❋❉s ✇✐t❤ t❤❡ s❛♠❡ ▲❍❙ ✐♥t♦ t❤❡ s❛♠❡ ✐♥t♦ ❛ s✐♥❣❧❡ r❡❧❛t✐♦♥✱ ❛♥❞ ♦♠✐t r❡❧❛t✐♦♥s t❤❛t ❛r❡ s✉❜s❡ts ♦❢ ♦t❤❡r r❡❧❛t✐♦♥s✳
✭❞✮ ❉♦❡s 2♦✉r s❝❤❡♠❛ ❛❧❧♦✇ r❡❞✉♥❞❛♥❝2❄ ❊1♣❧❛✐♥ ✇❤2✱ ♦r ✇❤2 ♥♦t✳
❙❤♦✇ ❛❧❧ 2♦✉r ✐♥t❡r♠❡❞✐❛t❡ st❡♣s✱ ❛♥❞ ❡1♣❧❛✐♥ ❛♥2 st❡♣s 2♦✉ ♠❛2 ❧❡❣✐t✐♠❛t❡❧2 ♦♠✐t✳
✷✳ ❘❡❧❛t✐♦♥ ❚ ❝♦♥t❛✐♥s ❛ttr✐❜✉t❡s ❈❉❊❋●❍■❏ ❛♥❞ ❢✉♥❝t✐♦♥❛❧ ❞❡♣❡♥❞❡♥❝✐❡s✿
❙❚ ❂❢❈✦❊❍❀❉❊■✦❋❀❋✦❉❀❊❍✦❈❏❀❏✦❋●■❣
✭❛✮ ❲❤✐❝❤ ♦❢ t❤❡ ❋❉s ✐♥ ❙❚ ✈✐♦❧❛t❡ ❇❈◆❋❄
✭❜✮ ❉❡❝♦♠♣♦s❡ ❚ ✐♥t♦ ❛ ❝♦❧❧❡❝t✐♦♥ ♦❢ r❡❧❛t✐♦♥s t❤❛t ❛r❡ ❡❛❝❤ ✐♥ ❇❈◆❋✱ ✉s✐♥❣ t❤❡ ❇❈◆❋ ❞❡❝♦♠♣♦s✐✲ t✐♦♥ ❛❧❣♦r✐t❤♠✳ ❨♦✉r ❞❡❝♦♠♣♦s✐t✐♦♥ s❤♦✉❧❞ ❜❡ ❧♦ss❧❡ss ❛♥❞ r❡❞✉♥❞❛♥❝2✲♣r❡s❡r✈✐♥❣✳ ❙❤♦✇ 2♦✉r ✐♥t❡r♠❡❞✐❛t❡ st❡♣s✱ ❡1♣❧❛✐♥✐♥❣ ❛♥2 st❡♣s t❤❛t 2♦✉ ♠❛2 ❧❡❣✐t✐♠❛t❡❧2 ♦♠✐t✳ Pr♦❥❡❝t ❙❚ ♦♥t♦ 2♦✉r ☞♥❛❧ s❡t ♦❢ r❡❧❛t✐♦♥s✱ ✇❤❡r❡ ❡✈❡r2 ▲❍❙ ❛♥❞ ❘❍❙ ✐s ✐♥ ❛❧♣❤❛❜❡t✐❝❛❧ ♦r❞❡r✱ ❛♥❞ ❡❛❝❤ ❧✐st ♦❢ ♣r♦❥❡❝t❡❞ ❋❉s ✐ts❡❧❢ s❤♦✉❧❞ ❜❡ ✐♥ ❛❧♣❤❛❜❡t✐❝❛❧ ♦r❞❡r✳
submissions
❙✉❜♠✐t t❤❡ ❢♦❧❧♦✇✐♥❣ ☞❧❡s ♦♥ ▼❛r❦❯s ✇❡❧❧ ❜❡❢♦r❡ ✹✿✵✵ ♦♥ ▼❛r❝❤ ✷✼✿ ✎ schema.ddl
✎ data.sql
✎ q1.sql, q2.sql, q3.sql, ❛♥❞ q4.sql
✎ dependencies.pdf
❖♥❡ s✉❜♠✐ss✐♦♥ ♣❡r ❣r♦✉♣✱ ✇❤❡t❤❡r ❛ ❣r♦✉♣ ✐s ♦♥❡ ♦r t✇♦ ♣❡♦♣❧❡✳ ❉❡❝❧❛r❡ 2♦✉r ❣r♦✉♣ ❜2 s✉❜♠✐tt✐♥❣ ❛♥ ❡♠♣t2✱ ♦r ♣❛rt✐❛❧✱ ☞❧❡✱ ❛♥❞ t❤✐s s❤♦✉❧❞ ❜❡ ❞♦♥❡ ✇❡❧❧ ❜❡❢♦r❡ t❤❡ ❞✉❡ ❞❛t❡✳ ❨♦✉ ♠❛2 ❛❧✇❛2s r❡♣❧❛❝❡ s✉❝❤ ❛ ☞❧❡ ✇✐t❤ ❛ ❜❡tt❡r ✈❡rs✐♦♥✱ ✉♥t✐❧ t❤❡ ❞✉❡ ❞❛t❡✳ ❲❡ ✇✐❧❧ ♥♦t ❤❛✈❡ ♠✉❝❤ ♣❛t✐❡♥❝❡ ✇✐t❤ ♣r♦❜❧❡♠s ❢♦r♠✐♥❣ ❣r♦✉♣s ❛t t❤❡ ❧❛st ♠✐♥✉t❡✱ s✐♥❝❡ t❤✐s ✐♥❞✐❝❛t❡s ❧❛❝❦ ♦❢ s❡r✐♦✉s♥❡ss ✐♥ ❣r♦✉♣ ✇♦r❦✳
❉♦✉❜❧❡ ❝❤❡❝❦ t❤❛t 2♦✉ ❤❛✈❡ s✉❜♠✐tt❡❞ t❤❡ ❝♦rr❡❝t ✈❡rs✐♦♥ ♦❢ 2♦✉r ☞❧❡s ❜2 ❞♦✇♥❧♦❛❞✐♥❣ t❤❡♠ ❢r♦♠ ▼❛r❦❯s✳
✸
marking
❲❡ ❛ss❡ss schema.ddl ❛♥❞ data.sql ❛❝❝♦r❞✐♥❣ t♦ ❤♦✇ ✇❡❧❧ t❤❡2 r❡♣r❡s❡♥t t❤❡ ❲❡t ❲♦r❧❞ ❞♦♠❛✐♥ ❛♥❞ t❤❡ ❛✐♠s ❧✐st❡❞ ❛❜♦✈❡✳ ❲❡ ✇✐❧❧ ♠❛r❦ q1.sql, q2.sql, q3.sql, ❛♥❞ q4.sql ❢♦r ❝♦rr❡❝t♥❡ss✳ ■♥ ❛❞❞✐t✐♦♥✱ ✇❡ ✇✐❧❧ ♠❛r❦ t❤❡ ❢♦❧❧♦✇✐♥❣ st2❧❡ ❝♦♥s✐❞❡r❛t✐♦♥s✿
✎ ❝❧❡❛r ❛♥❞ ✐♥❢♦r♠❛t✐✈❡ t❛❜❧❡✱ ✈✐❡✇ ❛♥❞ ❛ttr✐❜✉t❡ ♥❛♠❡s
✎ ❝♦♠♠❡♥ts ❢♦r ❡✈❡r2 ✈✐❡✇ ♦r t❛❜❧❡ ❞❡s❝r✐❜✐♥❣ t❤❡ r♦✇s ♦❢ t❤❡ t❛❜❧❡ ❛❝❝♦r❞✐♥❣ t♦ what t❤❡ ❞❛t❛ ♠❡❛♥s✱
r❛t❤❡r t❤❛♥ how t♦ ♦❜t❛✐♥ ✐t
✎ ✽✵ ❝❤❛r❛❝t❡r ❧✐♠✐t ♣❡r ❧✐♥❡
✎ ✈✐❡✇ ❛♥❞ t❛❜❧❡ ♥❛♠❡s st❛rt ✇✐t❤ ❛ ❝❛♣✐t❛❧✱ ❈❛♠❡❧❈❛s❡ ✐❢ t❤❡2 ✉s❡ ♠✉❧t✐♣❧❡ ✇♦r❞s
✎ ❙◗▲ ❦❡2✇♦r❞s s❤♦✉❧❞ ❡✐t❤❡r ❝♦♥s✐st❡♥t❧2 ❧♦✇❡r✲❝❛s❡ ♦r ❝♦♥s✐st❡♥t❧2 ❛❧❧✲❝❛♣s
✎ ✐♥❞❡♥t❛t✐♦♥ t♦ ✐♠♣r♦✈❡ r❡❛❞❛❜✐❧✐t2
✹