done

queries.md

@@ -8,94 +8,149 @@
 
 <!-- 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'),
+('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 5;
 <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;
+
 <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 OR licence = '' OR licence = 'unknown';
+
 <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 name
+FROM jslibraries
+WHERE main_technology ILIKE '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) AS total_stars
+FROM jslibraries;
+
 <br>
 
 **10. Get the average number of `contributors` for all the libraries.**
 
 <!-- Your Query Goes Here -->
 
+SELECT AVG(contributors) AS average_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 OR licence = '';
+
 <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 = -1
+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>