answers for q4,p2

lfcoding1 · lfcoding1 · commit 582179a441c8 · 2019-02-17T20:37:50.000+01:00
diff --git a/Week2/homework/part2.js b/Week2/homework/part2.js
@@ -17,4 +17,23 @@ let query = connection.query("CREATE TRIGGER language AFTER INSERT ON countrylan
   console.log(results);
 });  
 
+//correct answer:
+delimiter;;
+create procedure new_world.language_add (in_name varchar(52), in lang varchar(30), inoffical enum(‘T’, ‘F’), in _pct float(4,1))
+begin
+declare v_country_code char(3);
+declare v_new_lang_count int;
+select code into v_country_code from country where name = in_name;
+insert into countrylanguage( countrycode, language, isofficial, percentage)
+values
+(v_country_code, in_lang, in_official, in_pct);
+select(language) into v_new_lang_count
+from countrylanguage where countrycode = v_country_code;
+if v_new_lang_count >= 10
+then
+select concat(‘Warning: country’, in_name, ‘now has’, v_new_lang_count, ‘languages’);
+else
+select concat(‘Succeded: country’, in_name, ‘now has’, v_new_lang_count, ‘languages’);
+end if;
+end;;
 
diff --git a/Week2/homework/queries_mysql.txt b/Week2/homework/queries_mysql.txt
@@ -22,14 +22,15 @@ DEALLOCATE PREPARE capital;
 
 //2. List all the languages spoken in the region Y (Accept Y from user)
 Prepared Statement:
-PREPARE language FROM 'SELECT countrylanguage.language FROM countrylanguage INNER JOIN country ON country.code = countrylanguage.countrycode WHERE country.Region = ?';
+PREPARE language FROM 'SELECT DISTINCT countrylanguage.language FROM countrylanguage INNER JOIN country ON country.code = countrylanguage.countrycode WHERE country.Region = ?';
 
 Execution:
 SET @a = 'Middle East';
 EXECUTE language USING @a:
 
 Result:
 mysql> EXECUTE language USING @a;
+(this was without DISTINCT, therefore there are repeats of the languages)
 +-------------+
 | language    |
 +-------------+
diff --git a/Week2/homework/question4.js b/Week2/homework/question4.js
@@ -8,13 +8,19 @@ let connection = mysql.createConnection({
     password: "hyfuser",
     database: "new_world",
 });
+let select = 'select co.continent, co.name, l.language from country co inner join countrylanguage l on co.code = l.countrycode where l.language in (select l.language from country c inner join countrylanguage l on c.code = l.countrycode where c.name = "France" and l.isofficial = "T") and co.continent = (select continent from country where name = "Barbados")';
+  
 
 
 let userInput = process.argv[2] + ' ' + process.argv[3];
 let input2 = process.argv[4];
-let params = userInput + ' ' + input2;
-let query = connection.query('SELECT name FROM country WHERE region IN (SELECT region FROM country WHERE name = ? AND code IN (SELECT countrycode FROM countrylanguage WHERE language = "French" AND isOfficial = "T"))', params, ((err, results) =>{
+let params =userInput + ' ' + input2;
+let query = connection.query(select, params, ((err, results) =>{
     if (err) throw err;
     console.log(results);  
   }));
-  
+
+  connection.end();
+
+
+  
