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107 changes: 74 additions & 33 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,6 @@ In this lab, you will practice SQL by working with a PostgreSQL database. You wi

<br>


## Requirements

- Fork this repo
Expand Down Expand Up @@ -56,7 +55,6 @@ Since we will be querying our database from `psql`, you will need to copy/paste

In the `queries.md` file, you will find the instructions about the query you need to perform in each iteration and a space to fill the answer.


### Example

Here is an example of how you should paste your SQL queries in the `queries.md` file for each iteration:
Expand Down Expand Up @@ -121,52 +119,95 @@ You already know how this goes, so let's start running some queries on our datab
```js
[
{
name: 'solid',
owner: 'solidjs',
description: 'A declarative, efficient, and flexible JavaScript library for building user interfaces.',
name: "solid",
owner: "solidjs",
description:
"A declarative, efficient, and flexible JavaScript library for building user interfaces.",
stars: 10700,
url: 'solidjs.com',
url: "solidjs.com",
releases: 194,
licence: 'MIT License',
licence: "MIT License",
used_by: 624,
contributors: 73,
main_technology: 'typescript',
type: 'UI Library',
release_date: '2011-08-13'
main_technology: "typescript",
type: "UI Library",
release_date: "2011-08-13",
},
{
name: 'chartjs',
owner: 'chartjs',
description: 'Simple HTML5 Charts using the canvas tag.',
name: "chartjs",
owner: "chartjs",
description: "Simple HTML5 Charts using the canvas tag.",
stars: 54700,
url: 'chartjs.org',
url: "chartjs.org",
releases: 85,
licence: 'MIT License',
licence: "MIT License",
used_by: 414000,
contributors: 377,
main_technology: 'javascript',
type: 'Charts Library',
release_date: '2011-11-02'
}
main_technology: "javascript",
type: "Charts Library",
release_date: "2011-11-02",
},
];
```

<br>

2. Get **all the fields** of the library that was **released earliest** (first). <br> <br>
3. Get **all the fields** of the library that was **released most recently** (last). <br> <br>
4. All the libraries released **before 2015**. <br> <br>
5. Get the `name` and the `release_date` of the libraries **without a licence**. <br> <br>
6. Get the `name` and the `stars` from all **CSS Framework** libraries. <br> <br>
7. Get the `name` of the libraries where the main technology is **Typescript**. <br> <br>
8. Get the `name` and the `type` of all the libraries with **more than 1000 contributors**. <br> <br>
9. Get the **total** number of `stars` of **all the libraries**. <br> <br>
10. Get the **average** number of `contributors` for **all the libraries**. <br> <br>
11. Update the `licence` field of the **libriaries without a licence** to store `'unknown'` instead of `NULL`. <br> <br>
12. Update the `used_by` field of the **libraries that don't have it specified** to store `'unknown'` instead of `NULL`. <br> <br>
13. Update all the records to **capitalize the string** provided in the `main_technology` field. <br> <br>
14. Delete all the records where `licence` is `'unknown'`. <br> <br>
15. Delete all the records with **10000 or less** `stars`. <br> <br>
16. Delete all the records with **less than 100** `releases`. <br> <br>
3. SELECT \* FROM jslibraries
ORDER BY release_date ASC
LIMIT 1;

4. Get **all the fields** of the library that was **released most recently** (last). <br> <br>
5. SELECT \* FROM jslibraries
ORDER BY release_date DESC;

6. All the libraries released **before 2015**. <br> <br>
7. SELECT \*
FROM jslibraries
WHERE release_date < '2015-01-01';

8. Get the `name` and the `release_date` of the libraries **without a licence**. <br> <br>
9. SELECT name, release_date
FROM jslibraries
WHERE licence IS NULL OR licence = '';
10. Get the `name` and the `stars` from all **CSS Framework** libraries. <br> <br>
11. SELECT name,stars
FROM jslibraries
Where type = 'CSS Framework';
12. Get the `name` of the libraries where the main technology is **Typescript**. <br> <br>
13. SELECT name
FROM jslibraries
Where main_technology = 'typescript';
14. Get the `name` and the `type` of all the libraries with **more than 1000 contributors**. <br> <br>
15. SELECT name,type
FROM jslibraries
Where contributors > 1000;
16. Get the **total** number of `stars` of **all the libraries**. <br> <br>
17. SELECT SUM(stars) AS total_stars
FROM jslibraries;
18. Get the **average** number of `contributors` for **all the libraries**. <br> <br>
19. SELECT AVG(contributors) AS average_contributors
FROM jslibraries;
20. Update the `licence` field of the **libriaries without a licence** to store `'unknown'` instead of `NULL`. <br> <br>
21. UPDATE jslibraries
SET licence = 'unknown'
WHERE licence IS NULL;
22. Update the `used_by` field of the **libraries that don't have it specified** to store `'unknown'` instead of `NULL`. <br> <br>
23. UPDATE jslibraries
SET used_by = -1
WHERE used_by IS NULL;
24. Update all the records to **capitalize the string** provided in the `main_technology` field. <br> <br>
25. UPDATE jslibraries
SET main_technology = UPPER(main_technology);
26. Delete all the records where `licence` is `'unknown'`. <br> <br>
27. DELETE FROM jslibraries
WHERE licence = 'unknown';

28. Delete all the records with **10000 or less** `stars`. <br> <br>
29. DELETE FROM jslibraries
WHERE stars <= 10000;
30. Delete all the records with **less than 100** `releases`. <br> <br>
31. DELETE FROM jslibraries
WHERE releases < 100;

Happy Coding! 💙