From 34dd9f977c19d5f42aa1bdb22d76e4591d4cd2a2 Mon Sep 17 00:00:00 2001 From: MrMatroxa Date: Mon, 10 Mar 2025 11:29:13 +0100 Subject: [PATCH] done --- queries.md | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/queries.md b/queries.md index c3c5329..55c4d14 100644 --- a/queries.md +++ b/queries.md @@ -7,12 +7,21 @@ **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 +```
@@ -20,82 +29,138 @@ +``` +SELECT * FROM jslibraries ORDER BY release_date DESC +``` +
**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_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 IS NULL; +``` +
**12. Update the `used_by` field of the libraries that don't have this information to store `'unknown'` instead of `NULL`.** +``` +UPDATE jslibraries SET used_by='unknown' 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; +``` +