diff --git a/queries.md b/queries.md index 4bee1ef..04181c3 100644 --- a/queries.md +++ b/queries.md @@ -7,95 +7,139 @@ **1. Add the `solid` and `chartjs` libraries as new rows to the `jslibraries` table.** +INSERT INTO jslibraries 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 MIN(release_date) AS earliest from jslibraries;
**3. Get all the fields of the library that was released most recently (last).** +SELECT MAX(release_date) AS last from jslibraries;
**4. All the libraries released before 2015.** +SELECT * FROM jslibraries WHERE release_date < '2015-01-01';
**5. Get the `name` and the `release_date` of the libraries without a licence.** +SELECT name,release_date FROM jslibraries WHERE licence is null;
**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 SUM(stars) AS total 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 IS NULL;
**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 IS NULL;
**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;