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'
);
INSERT INTO jslibraries (name, owner, description, stars, url, releases, licence, used_by, contributors, main_technology, type, release_date)
VALUES (
'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
LIMIT 1;
3. Get all the fields of the library that was released most recently (last). SELECT * FROM jslibraries ORDER BY release_date DESC LIMIT 1;
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) AS average_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 = INITCAP(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;