diff --git a/queries.md b/queries.md
index c3c5329..e9656cf 100644
--- a/queries.md
+++ b/queries.md
@@ -12,90 +12,120 @@
 
 **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 < '2016-05-30';
 
 <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 LIKE '%CSS%';
 
 <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 = '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 = 0
+WHERE used_by IS NULL;
+
+OR 
+
+ALTER TABLE jslibraries
+ALTER COLUMN used_by TYPE VARCHAR;
+
+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 = UPPER(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>