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done #21

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49 changes: 49 additions & 0 deletions queries.md
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Original file line number Diff line number Diff line change
Expand Up @@ -8,66 +8,107 @@

<!-- Your Query Goes Here -->

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'
)

<br>

**2. Get all the fields of the library that was released earliest (first).**

<!-- Your Query Goes Here -->

SELECT \* FROM jslibraries order by release_date 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 < '2015-01-01'

<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
<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 Framework'
<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 like '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`.**
Expand All @@ -80,22 +121,30 @@

<!-- Your Query Goes Here -->

update jslibraries
set main_technology = INITCAP(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>