done

queries.md

@@ -8,94 +8,146 @@
 
 <!-- Your Query Goes Here -->
 
+insert into jslibraries (name, owner, description, stars, url, releases, licence, used_by, contributors, main_technology, type, release_date) values ('solid', 'solidjs', 'A declarative, efficient, and flexible JavaScript library for building user interfaces.', 10700, 'solidjs.com', 194, 'MIT License', 624, 73, 'typescript', 'UI Library', '2011-08-13');
+
+INSERT INTO jslibraries VALUES (
+'chartjs',
+'chartjs',
+'Simple HTML5 Charts using the canvas tag.',
+54700,
+'chartjs.org',
+85,
+'MIT License',
+414000,
+377,
+'javascript',
+'Charts Library',
+'2011-11-02'
+);
+
 <br>
 
 **2. Get all the fields of the library that was released earliest (first).**
 
 <!-- Your Query Goes Here -->
 
+select \* from jslibraries order by release_date asc limit 1;
+
 <br>
 
 **3. Get all the fields of the library that was released most recently (last).**
 
 <!-- Your Query Goes Here -->
 
+select \* from jslibraries order by release_date desc limit 1;
+
 <br>
 
 **4. All the libraries released before 2015.**
 
 <!-- Your Query Goes Here -->
 
+select \* from jslibraries where release_date < '2015-01-01'
+
 <br>
 
 **5. Get the `name` and the `release_date` of the libraries without a licence.**
 
 <!-- Your Query Goes Here -->
 
+select name, release_date from jslibraries where licence is null
+
 <br>
 
 **6. Get the `name` and the `stars` from all CSS Framework libraries.**
 
 <!-- Your Query Goes Here -->
 
+select name, stars from jslibraries where type = 'CSS Framework'
+
 <br>
 
 **7. Get the `name` of the libraries where the main technology is Typescript.**
 
 <!-- Your Query Goes Here -->
 
+select \* from jslibraries where main_technology = 'typescript'
+
 <br>
 
 **8. Get the `name` and the `type` of all the libraries with more than 1000 contributors.**
 
 <!-- Your Query Goes Here -->
 
+select name, type from jslibraries where contributors > 1000
+
 <br>
 
 **9. Get the total number of `stars` of all the libraries.**
 
 <!-- Your Query Goes Here -->
 
+select sum(stars) from jslibraries
+
 <br>
 
 **10. Get the average number of `contributors` for all the libraries.**
 
 <!-- Your Query Goes Here -->
 
+select avg(contributors) from jslibraries
+
 <br>
 
 **11. Update the `licence` field of the libriaries without a licence to store `'unknown'` instead of `NULL`.**
 
 <!-- Your Query Goes Here -->
 
+update jslibraries
+set licence = 'unknown'
+where licence is null
+
 <br>
 
 **12. Update the `used_by` field of the libraries that don't have this information to store `'unknown'` instead of `NULL`.**
 
 <!-- Your Query Goes Here -->
 
+update jslibraries
+set used_by = 'unknown'
+where used_by is null
+
 <br>
 
 **13. Update all the records to capitalize the string provided in the `main_technology` field.**
 
 <!-- Your Query Goes Here -->
 
+UPDATE jslibraries
+SET main_technology = initcap(main_technology);
+
 <br>
 
 **14. Delete all the records where `licence` is `'unknown'`.**
 
 <!-- Your Query Goes Here -->
 
+delete from jslibraries where licence = 'unknown'
+
 <br>
 
 **15. Delete all the records with 10000 or less `stars`.**
 
 <!-- Your Query Goes Here -->
 
+delete from jslibraries where stars <= 10000
+
 <br>
 
 **16. Delete all the records with less than 100 `releases`.**
 
 <!-- Your Query Goes Here -->
 
+delete from jslibraries where releases < 100
+
 <br>