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  9. <title>Lab 6 Amirlan Sharipov (BS-CS21-01)</title>

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  198. <div id="content" class="content">

  199. <h1 class="title">Lab 6 Amirlan Sharipov (BS-CS21-01)</h1>

  200. <div id="table-of-contents" role="doc-toc">

  201. <h2>Table of Contents</h2>

  202. <div id="text-table-of-contents" role="doc-toc">

  203. <ul>

  204. <li><a href="#org66e9ff0">1. Disclaimer</a></li>

  205. <li><a href="#orge252c5e">2. Exercise 1</a>

  206. <ul>

  207. <li><a href="#org7e66bfe">2.1. Table creation and insertion</a></li>

  208. <li><a href="#org4bc389b">2.2. Queries</a></li>

  209. </ul>

  210. </li>

  211. <li><a href="#org613a69d">3. Exercise 2</a>

  212. <ul>

  213. <li><a href="#orgd2fe10b">3.1. Normalization</a>

  214. <ul>

  215. <li><a href="#org3192edb">3.1.1. 1NF</a></li>

  216. <li><a href="#org7985b8c">3.1.2. 2NF</a></li>

  217. <li><a href="#orgcc1c4fe">3.1.3. 3NF</a></li>

  218. <li><a href="#org5a0e8c4">3.1.4. BCNF and 4NF</a></li>

  219. <li><a href="#org19e9a14">3.1.5. Code</a></li>

  220. </ul>

  221. </li>

  222. <li><a href="#org7829592">3.2. Queries</a></li>

  223. </ul>

  224. </li>

  225. </ul>

  226. </div>

  227. </div>

  228. 

  229. <div id="outline-container-org66e9ff0" class="outline-2">

  230. <h2 id="org66e9ff0"><span class="section-number-2">1.</span> Disclaimer</h2>

  231. <div class="outline-text-2" id="text-1">

  232. <p>

  233. Please, use the lab6.sql file to read/copy the source code. Also, the html version of this document looks better than the pdf one.

  234. </p>

  235. </div>

  236. </div>

  237. 

  238. <div id="outline-container-orge252c5e" class="outline-2">

  239. <h2 id="orge252c5e"><span class="section-number-2">2.</span> Exercise 1</h2>

  240. <div class="outline-text-2" id="text-2">

  241. </div>

  242. <div id="outline-container-org7e66bfe" class="outline-3">

  243. <h3 id="org7e66bfe"><span class="section-number-3">2.1.</span> Table creation and insertion</h3>

  244. <div class="outline-text-3" id="text-2-1">

  245. <p>

  246. I used the schema provided in the slides. And then manually inserted data into the tables.

  247. </p>

  248. 

  249. <div class="org-src-container">

  250. <pre class="src src-sql"><span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">customers</span> (

  251.     customerId <span style="color: #c792ea;">INT</span>,

  252.     customerName <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">50</span>),

  253.     city <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">50</span>),

  254.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (customerId)

  255. );

  256. 

  257. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">items</span> (

  258.     itemId <span style="color: #c792ea;">INT</span>,

  259.     itemName <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">50</span>),

  260.     price <span style="color: #c792ea;">FLOAT</span>,

  261.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (itemId)

  262. );

  263. 

  264. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">orders</span> (

  265.     orderId <span style="color: #c792ea;">INT</span>,

  266.     customerId <span style="color: #c792ea;">INT</span>,

  267.     <span style="color: #c792ea;">date</span> <span style="color: #c792ea;">DATE</span>,

  268.     <span style="color: #89DDFF;">FOREIGN</span> <span style="color: #89DDFF;">KEY</span> (customerId) <span style="color: #89DDFF;">REFERENCES</span> customers(customerId),

  269.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (orderId)

  270. );

  271. 

  272. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">order_details</span> (

  273.     orderId <span style="color: #c792ea;">INT</span>,

  274.     itemId <span style="color: #c792ea;">INT</span>,

  275.     quantity <span style="color: #c792ea;">INT</span>,

  276.     <span style="color: #89DDFF;">FOREIGN</span> <span style="color: #89DDFF;">KEY</span> (itemId) <span style="color: #89DDFF;">REFERENCES</span> items(itemId),

  277.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (orderId, itemId)

  278. );

  279. 

  280. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> customers <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'101'</span>, <span style="color: #c3e88d;">'Martin'</span>, <span style="color: #c3e88d;">'Prague'</span>);

  281. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> customers <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'107'</span>, <span style="color: #c3e88d;">'Herman'</span>, <span style="color: #c3e88d;">'Madrid'</span>);

  282. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> customers <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'110'</span>, <span style="color: #c3e88d;">'Pedro'</span>, <span style="color: #c3e88d;">'Moscow'</span>);

  283. 

  284. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> items <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'3786'</span>, <span style="color: #c3e88d;">'Net'</span>, <span style="color: #f78c6c; font-weight: bold;">35.0</span>);

  285. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> items <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'4011'</span>, <span style="color: #c3e88d;">'Racket'</span>, <span style="color: #f78c6c; font-weight: bold;">65.0</span>);

  286. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> items <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'9132'</span>, <span style="color: #c3e88d;">'Pack-3'</span>, <span style="color: #f78c6c; font-weight: bold;">4.75</span>);

  287. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> items <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'5794'</span>, <span style="color: #c3e88d;">'Pack-6'</span>, <span style="color: #f78c6c; font-weight: bold;">5.0</span>);

  288. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> items <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'3141'</span>, <span style="color: #c3e88d;">'Cover'</span>, <span style="color: #f78c6c; font-weight: bold;">10.0</span>);

  289. 

  290. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> orders <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'2301'</span>, <span style="color: #c3e88d;">'101'</span>, <span style="color: #c3e88d;">'2011-02-23'</span>);

  291. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> orders <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'2302'</span>, <span style="color: #c3e88d;">'107'</span>, <span style="color: #c3e88d;">'2011-02-25'</span>);

  292. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> orders <span style="color: #89DDFF;">VALUES</span>(<span style="color: #c3e88d;">'2303'</span>, <span style="color: #c3e88d;">'110'</span>, <span style="color: #c3e88d;">'2011-02-27'</span>);

  293. 

  294. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> order_details <span style="color: #89DDFF;">VALUES</span> (<span style="color: #c3e88d;">'2301'</span>, <span style="color: #c3e88d;">'3786'</span>, <span style="color: #f78c6c; font-weight: bold;">3</span>);

  295. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> order_details <span style="color: #89DDFF;">VALUES</span> (<span style="color: #c3e88d;">'2301'</span>, <span style="color: #c3e88d;">'4011'</span>, <span style="color: #f78c6c; font-weight: bold;">6</span>);

  296. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> order_details <span style="color: #89DDFF;">VALUES</span> (<span style="color: #c3e88d;">'2301'</span>, <span style="color: #c3e88d;">'9132'</span>, <span style="color: #f78c6c; font-weight: bold;">8</span>);

  297. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> order_details <span style="color: #89DDFF;">VALUES</span> (<span style="color: #c3e88d;">'2302'</span>, <span style="color: #c3e88d;">'5794'</span>, <span style="color: #f78c6c; font-weight: bold;">4</span>);

  298. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> order_details <span style="color: #89DDFF;">VALUES</span> (<span style="color: #c3e88d;">'2303'</span>, <span style="color: #c3e88d;">'4011'</span>, <span style="color: #f78c6c; font-weight: bold;">2</span>);

  299. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> order_details <span style="color: #89DDFF;">VALUES</span> (<span style="color: #c3e88d;">'2303'</span>, <span style="color: #c3e88d;">'3141'</span>, <span style="color: #f78c6c; font-weight: bold;">2</span>);

  300. </pre>

  301. </div>

  302. </div>

  303. </div>

  304. 

  305. <div id="outline-container-org4bc389b" class="outline-3">

  306. <h3 id="org4bc389b"><span class="section-number-3">2.2.</span> Queries</h3>

  307. <div class="outline-text-3" id="text-2-2">

  308. <p>

  309. First query takes the sum of all prices * quantities groupped by the orders and sorts them.

  310. The second query does the same thing, groups by customers, sorts by sum of quantities (descending order) and takes the first result.

  311. </p>

  312. <div class="org-src-container">

  313. <pre class="src src-sql"><span style="color: #89DDFF;">SELECT</span> order_details.orderId, <span style="color: #82aaff;">SUM</span>(items.price * order_details.quantity)

  314. <span style="color: #89DDFF;">FROM</span> order_details

  315. <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> items <span style="color: #89DDFF;">on</span> items.itemId=order_details.itemId

  316. <span style="color: #89DDFF;">group</span> <span style="color: #89DDFF;">by</span> order_details.orderId <span style="color: #89DDFF;">ORDER</span> <span style="color: #89DDFF;">BY</span> <span style="color: #82aaff;">sum</span> <span style="color: #89DDFF;">ASC</span>;

  317. 

  318. <span style="color: #89DDFF;">SELECT</span> customers.customerName, customers.city <span style="color: #89DDFF;">FROM</span> customers

  319. <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> orders <span style="color: #89DDFF;">ON</span> customers.customerId=orders.customerId

  320. <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> order_details <span style="color: #89DDFF;">ON</span> order_details.orderId=orders.orderId

  321. <span style="color: #89DDFF;">GROUP</span> <span style="color: #89DDFF;">BY</span> customers.customerId

  322. <span style="color: #89DDFF;">ORDER</span> <span style="color: #89DDFF;">BY</span> <span style="color: #82aaff;">SUM</span>(order_details.quantity) <span style="color: #89DDFF;">DESC</span>

  323. <span style="color: #89DDFF;">LIMIT</span> <span style="color: #f78c6c; font-weight: bold;">1</span>;

  324. </pre>

  325. </div>

  326. </div>

  327. </div>

  328. </div>

  329. 

  330. <div id="outline-container-org613a69d" class="outline-2">

  331. <h2 id="org613a69d"><span class="section-number-2">3.</span> Exercise 2</h2>

  332. <div class="outline-text-2" id="text-3">

  333. </div>

  334. <div id="outline-container-orgd2fe10b" class="outline-3">

  335. <h3 id="orgd2fe10b"><span class="section-number-3">3.1.</span> Normalization</h3>

  336. <div class="outline-text-3" id="text-3-1">

  337. <p>

  338. I have several assumptions:

  339. </p>

  340. <ul class="org-ul">

  341. <li>Any teacher can work at several schools at once (or change the school)</li>

  342. <li>Room numbers don&rsquo;t depend on schools: the first number of the room name is not enough to assume the opposite</li>

  343. <li>Teachers may teach several courses: it&rsquo;s an elementary school, usually teachers can teach anything in elementary schools</li>

  344. </ul>

  345. </div>

  346. 

  347. <div id="outline-container-org3192edb" class="outline-4">

  348. <h4 id="org3192edb"><span class="section-number-4">3.1.1.</span> 1NF</h4>

  349. <div class="outline-text-4" id="text-3-1-1">

  350. <p>

  351. It&rsquo;s almost in 1NF state. Each cell is already atomic, values of the same domain, etc. The only thing that&rsquo;s not there is the primary key. Let&rsquo;s say for now that the primary key is a tuple of school, teacher, course, room, grade, and book. This way there are no conflicts. It still looks like a mess, so I will normalize it further.

  352. </p>

  353. </div>

  354. </div>

  355. <div id="outline-container-org7985b8c" class="outline-4">

  356. <h4 id="org7985b8c"><span class="section-number-4">3.1.2.</span> 2NF</h4>

  357. <div class="outline-text-4" id="text-3-1-2">

  358. <p>

  359. Make new tables with relations for partial functional dependencies of non-prime attributes on candidate keys:

  360. </p>

  361. <ul class="org-ul">

  362. <li>lessons (lessonId, schoolName, teacherName, courseName, roomName, gradeName)</li>

  363. <li>books (bookId, bookName, publisherName)</li>

  364. <li>loans (loanId, lessonId, bookId, loanDate)</li>

  365. </ul>

  366. </div>

  367. </div>

  368. <div id="outline-container-orgcc1c4fe" class="outline-4">

  369. <h4 id="orgcc1c4fe"><span class="section-number-4">3.1.3.</span> 3NF</h4>

  370. <div class="outline-text-4" id="text-3-1-3">

  371. <p>

  372. Make new tables (with appropriate IDs) with relations for transitive functional dependencies of non-prime attribute on candidate key:

  373. </p>

  374. <ul class="org-ul">

  375. <li>schools (schoolId, schoolName)</li>

  376. <li>teachers (teacherId, teacherName)</li>

  377. <li>courses (courseId, courseName)</li>

  378. <li>rooms (roomId, roomName)</li>

  379. <li>grades (gradeId, gradeName)</li>

  380. <li>publishers (publisherId, publisherName)</li>

  381. <li>lessons (lessonId, schoolId, teacherId, courseId, roomId, gradeId)</li>

  382. <li>books (bookId, bookName, publisherId)</li>

  383. <li>loans (loanId, lessonId, bookId, loanDate)</li>

  384. </ul>

  385. </div>

  386. </div>

  387. <div id="outline-container-org5a0e8c4" class="outline-4">

  388. <h4 id="org5a0e8c4"><span class="section-number-4">3.1.4.</span> BCNF and 4NF</h4>

  389. <div class="outline-text-4" id="text-3-1-4">

  390. <p>

  391. Already satisfies.

  392. </p>

  393. </div>

  394. </div>

  395. 

  396. <div id="outline-container-org19e9a14" class="outline-4">

  397. <h4 id="org19e9a14"><span class="section-number-4">3.1.5.</span> Code</h4>

  398. <div class="outline-text-4" id="text-3-1-5">

  399. <div class="org-src-container">

  400. <pre class="src src-sql"><span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">schools</span> (

  401.     schoolId SERIAL,

  402.     schoolName <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">50</span>),

  403.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (schoolId)

  404. );

  405. 

  406. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">teachers</span> (

  407.     teacherId SERIAL,

  408.     teacherName <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">30</span>),

  409.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (teacherId)

  410. );

  411. 

  412. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">courses</span> (

  413.     courseId SERIAL,

  414.     courseName <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">40</span>),

  415.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (courseId)

  416. );

  417. 

  418. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">rooms</span> (

  419.     roomId SERIAL,

  420.     roomName <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">40</span>),

  421.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (roomId)

  422. );

  423. 

  424. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">grades</span> (

  425.     gradeId SERIAL,

  426.     gradeName <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">15</span>),

  427.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (gradeId)

  428. );

  429. 

  430. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">publishers</span> (

  431.     publisherId SERIAL,

  432.     publisherName <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">30</span>),

  433.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (publisherId)

  434. );

  435. 

  436. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">books</span> (

  437.     bookId SERIAL,

  438.     bookName <span style="color: #c792ea;">VARCHAR</span>(<span style="color: #f78c6c; font-weight: bold;">60</span>),

  439.     publisherId <span style="color: #c792ea;">INT</span>,

  440.     <span style="color: #89DDFF;">FOREIGN</span> <span style="color: #89DDFF;">KEY</span> (publisherId) <span style="color: #89DDFF;">REFERENCES</span> publishers(publisherId),

  441.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (bookId)

  442. );

  443. 

  444. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">lessons</span> (

  445.     lessonId SERIAL,

  446.     schoolId <span style="color: #c792ea;">INT</span>,

  447.     teacherId <span style="color: #c792ea;">INT</span>,

  448.     courseId <span style="color: #c792ea;">INT</span>,

  449.     roomId <span style="color: #c792ea;">INT</span>,

  450.     gradeId <span style="color: #c792ea;">INT</span>,

  451.     <span style="color: #89DDFF;">FOREIGN</span> <span style="color: #89DDFF;">KEY</span> (teacherId) <span style="color: #89DDFF;">REFERENCES</span> teachers(teacherId),

  452.     <span style="color: #89DDFF;">FOREIGN</span> <span style="color: #89DDFF;">KEY</span> (courseId) <span style="color: #89DDFF;">REFERENCES</span> courses(courseId),

  453.     <span style="color: #89DDFF;">FOREIGN</span> <span style="color: #89DDFF;">KEY</span> (roomId) <span style="color: #89DDFF;">REFERENCES</span> rooms(roomId),

  454.     <span style="color: #89DDFF;">FOREIGN</span> <span style="color: #89DDFF;">KEY</span> (gradeId) <span style="color: #89DDFF;">REFERENCES</span> grades(gradeId),

  455.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (lessonId)

  456. );

  457. 

  458. <span style="color: #89DDFF;">CREATE</span> <span style="color: #89DDFF;">TABLE</span> <span style="color: #82aaff;">loans</span> (

  459.     loanId SERIAL,

  460.     lessonId <span style="color: #c792ea;">INT</span>,

  461.     bookId <span style="color: #c792ea;">INT</span>,

  462.     loanDate <span style="color: #c792ea;">DATE</span>,

  463.     <span style="color: #89DDFF;">FOREIGN</span> <span style="color: #89DDFF;">KEY</span> (lessonId) <span style="color: #89DDFF;">REFERENCES</span> lessons(lessonId),

  464.     <span style="color: #89DDFF;">FOREIGN</span> <span style="color: #89DDFF;">KEY</span> (bookId) <span style="color: #89DDFF;">REFERENCES</span> books(bookId),

  465.     <span style="color: #89DDFF;">PRIMARY</span> <span style="color: #89DDFF;">KEY</span> (loanId)

  466. );

  467. 

  468. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> schools (schoolName)

  469.     <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> school <span style="color: #89DDFF;">FROM</span> loan_books;

  470. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> teachers (teacherName)

  471.     <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> teacher <span style="color: #89DDFF;">FROM</span> loan_books;

  472. <span style="color: #676E95;">-- </span><span style="color: #676E95;">Inserted Numerical thinking 2 times because of case sensitivity. Not gonna change anything.</span>

  473. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> courses (courseName)

  474.     <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> course <span style="color: #89DDFF;">FROM</span> loan_books;

  475. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> rooms (roomName)

  476.     <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> room <span style="color: #89DDFF;">FROM</span> loan_books;

  477. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> grades (gradeName)

  478.     <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> grade <span style="color: #89DDFF;">FROM</span> loan_books;

  479. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> publishers (publisherName)

  480.     <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> publisher <span style="color: #89DDFF;">FROM</span> loan_books;

  481. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> books (bookName, publisherId)

  482.     <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> loan_books.book,

  483.     publishers.publisherId <span style="color: #89DDFF;">FROM</span> loan_books

  484.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> publishers <span style="color: #89DDFF;">ON</span>

  485.         publishers.publisherName=loan_books.publisher;

  486. 

  487. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> lessons (schoolId, teacherId, courseId, roomId, gradeId)

  488.     <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> schools.schoolId, teachers.teacherId,

  489.         courses.courseId, rooms.roomId, grades.gradeId <span style="color: #89DDFF;">FROM</span> loan_books

  490.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> schools <span style="color: #89DDFF;">ON</span> schools.schoolName=loan_books.school

  491.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> teachers <span style="color: #89DDFF;">ON</span> teachers.teacherName=loan_books.teacher

  492.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> courses <span style="color: #89DDFF;">ON</span> courses.courseName=loan_books.course

  493.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> rooms <span style="color: #89DDFF;">ON</span> rooms.roomName=loan_books.room

  494.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> grades <span style="color: #89DDFF;">ON</span> grades.gradeName=loan_books.grade;

  495. 

  496. <span style="color: #89DDFF;">INSERT</span> <span style="color: #89DDFF;">INTO</span> loans (lessonId, bookId, loanDate)

  497.     <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> lessons.lessonId, books.bookId,

  498.         loan_books.loanDate <span style="color: #89DDFF;">FROM</span> loan_books

  499.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> schools <span style="color: #89DDFF;">ON</span> schools.schoolName=loan_books.school

  500.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> teachers <span style="color: #89DDFF;">ON</span> teachers.teacherName=loan_books.teacher

  501.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> courses <span style="color: #89DDFF;">ON</span> courses.courseName=loan_books.course

  502.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> rooms <span style="color: #89DDFF;">ON</span> rooms.roomName=loan_books.room

  503.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> grades <span style="color: #89DDFF;">ON</span> grades.gradeName=loan_books.grade

  504.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> books <span style="color: #89DDFF;">ON</span> books.bookName=loan_books.book

  505.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> lessons <span style="color: #89DDFF;">ON</span> lessons.gradeId=grades.gradeId

  506.         <span style="color: #89DDFF;">and</span> lessons.roomId=rooms.roomId

  507.         <span style="color: #89DDFF;">and</span> lessons.courseId=courses.courseId

  508.         <span style="color: #89DDFF;">and</span> lessons.teacherId=teachers.teacherId;

  509. </pre>

  510. </div>

  511. </div>

  512. </div>

  513. </div>

  514. <div id="outline-container-org7829592" class="outline-3">

  515. <h3 id="org7829592"><span class="section-number-3">3.2.</span> Queries</h3>

  516. <div class="outline-text-3" id="text-3-2">

  517. <p>

  518. The first query list all the schools that borrowed the books of every publisher using DISTINCT keyword.

  519. The second query orders the results from each school, and takes only 1 loan that has the highest loanDate for each school.

  520. </p>

  521. <div class="org-src-container">

  522. <pre class="src src-sql"><span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> publishers.publisherName, books.bookName,

  523.     schools.schoolName <span style="color: #89DDFF;">FROM</span> books

  524.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> loans <span style="color: #89DDFF;">ON</span> loans.bookId=books.bookId

  525.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> lessons <span style="color: #89DDFF;">ON</span> lessons.lessonId=loans.lessonId

  526.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> schools <span style="color: #89DDFF;">ON</span> schools.schoolId=lessons.schoolId

  527.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> publishers <span style="color: #89DDFF;">ON</span> publishers.publisherId=books.publisherId

  528.     <span style="color: #89DDFF;">ORDER</span> <span style="color: #89DDFF;">BY</span> publishers.publisherName;

  529. 

  530. <span style="color: #89DDFF;">SELECT</span> <span style="color: #89DDFF;">DISTINCT</span> <span style="color: #89DDFF;">ON</span> (schools.schoolName) schools.schoolName,

  531.     publishers.publisherName, books.bookName <span style="color: #89DDFF;">FROM</span> loans

  532.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> lessons <span style="color: #89DDFF;">ON</span> lessons.lessonId=loans.lessonId

  533.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> schools <span style="color: #89DDFF;">ON</span> schools.schoolId=lessons.schoolId

  534.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> books <span style="color: #89DDFF;">ON</span> books.bookId=loans.bookId

  535.     <span style="color: #89DDFF;">INNER</span> <span style="color: #89DDFF;">JOIN</span> publishers <span style="color: #89DDFF;">ON</span> publishers.publisherId=books.publisherId

  536.     <span style="color: #89DDFF;">ORDER</span> <span style="color: #89DDFF;">BY</span> schools.schoolName, loans.loanDate <span style="color: #89DDFF;">DESC</span>, <span style="color: #f78c6c; font-weight: bold;">1</span>;

  537. </pre>

  538. </div>

  539. </div>

  540. </div>

  541. </div>

  542. </div>

  543. <div id="postamble" class="status">

  544. <p class="author">Author: Amirlan Sharipov (BS-CS21-01)</p>

  545. <p class="date">Created: 2023-02-28 Tue 23:48</p>

  546. </div>

  547. </body>

  548. </html>