diff --git a/queries.md b/queries.md index 4bee1ef..759a770 100644 --- a/queries.md +++ b/queries.md @@ -7,95 +7,101 @@ **1. Add the `solid` and `chartjs` libraries as new rows to the `jslibraries` table.** + 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');
**2. Get all the fields of the library that was released earliest (first).** +SELECT * from jslibraries ORDER BY release_date asc;
**3. Get all the fields of the library that was released most recently (last).** +SELECT * from jslibraries ORDER BY release_date desc;
**4. All the libraries released before 2015.** - + SELECT * FROM jslibraries WHERE release_date <= '2015-01-01'; + SELECT * from jslibraries ORDER BY release_date asc limit 6 ;
**5. Get the `name` and the `release_date` of the libraries without a licence.** + SELECT name , release_date, licence FROM jslibraries where licence isnull;
**6. Get the `name` and the `stars` from all CSS Framework libraries.** + SELECT name, stars FROM jslibraries WHERE type = 'CSS Framework';
**7. Get the `name` of the libraries where the main technology is Typescript.** + SELECT name FROM jslibraries WHERE main_technology = 'typescript';
**8. Get the `name` and the `type` of all the libraries with more than 1000 contributors.** - +SELECT name, type FROM jslibraries WHERE contributors > 1000;
**9. Get the total number of `stars` of all the libraries.** - +SELECT stars FROM jslibraries;
**10. Get the average number of `contributors` for all the libraries.** - +SELECT AVG(contributors) FROM jslibraries;
**11. Update the `licence` field of the libriaries without a licence to store `'unknown'` instead of `NULL`.** - - +UPDATE jslibraries SET licence = 'unknown' WHERE licence isnull;
**12. Update the `used_by` field of the libraries that don't have it specified to store `0` ( i.e., number zero), instead of `NULL`.** - + UPDATE jslibraries SET used_by = 0 where used_by isnull;
**13. Update all the records to capitalize the string provided in the `main_technology` field.** - +UPDATE jslibraries SET main_technology = UPPER(main_technology);
**14. Delete all the records where `licence` is `'unknown'`.** - +Delete from jslibraries where licence = 'unknown';
**15. Delete all the records with 10000 or less `stars`.** - + Delete from jslibraries where stars <= 10000;
**16. Delete all the records with less than 100 `releases`.** - +Delete from jslibraries where releases < 100;