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FT_RMT_111124 AlineConceicao #24

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187 changes: 187 additions & 0 deletions queries.md
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Original file line number Diff line number Diff line change
Expand Up @@ -7,95 +7,282 @@
**1. Add the `solid` and `chartjs` libraries as new rows to the `jslibraries` table.**

<!-- Your Query Goes Here -->
```sql
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');



name | owner | description | stars | url | releases | licence | used_by | contributors | main_technology | type | release_date
---------+---------+-----------------------------------------------------------------------------------------+-------+-------------+----------+-------------+---------+--------------+-----------------+----------------+--------------
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 rows)

```


<br>

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

<!-- Your Query Goes Here -->

```sql

SELECT * FROM jslibraries ORDER BY release_date ASC LIMIT 1;



name | owner | description | stars | url | releases | licence | used_by | contributors | main_technology | type | release_date
-------+---------+-----------------------------------------------------------------------------------------+-------+-------------+----------+-------------+---------+--------------+-----------------+------------+--------------
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
(1 row)
```

<br>

**3. Get all the fields of the library that was released most recently (last).**

<!-- Your Query Goes Here -->
```sql
SELECT * FROM jslibraries ORDER BY release_date DESC LIMIT 1;


name | owner | description | stars | url | releases | licence | used_by | contributors | main_technology | type | release_date
-----------+-----------+---------------------------------------------------------------------------+-------+---------------+----------+-------------+---------+--------------+-----------------+--------------------+--------------
chakra-ui | chakra-ui | ⚡️ Simple, Modular & Accessible UI Components for your React Applications. | 20300 | chakra-ui.com | 2073 | MIT License | 23100 | 429 | typescript | Components Library | 2018-08-12
(1 row)
```


<br>

**4. All the libraries released before 2015.**

<!-- Your Query Goes Here -->
```sql
SELECT * FROM jslibraries WHERE release_date < '2015-01-01';


name | owner | description | stars | url | releases | licence | used_by | contributors | main_technology | type | release_date
------------+----------------+-------------------------------------------------------------------------------------------+--------+--------------------------------------------+----------+-------------+---------+--------------+-----------------+--------------------+--------------
react | facebook | A declarative, efficient, and flexible JavaScript library for building user interfaces. | 174000 | reactjs.org | 138 | MIT License | 7400000 | 1501 | javascript | SPA library | 2014-08-23
ant-design | ant-design | VAn enterprise-class UI design language and React UI library. | 34600 | ant.design | 474 | MIT License | 233000 | 1469 | typescript | Components Library | 2012-12-16
victory | FormidableLabs | A collection of composable React components for building interactive data visualizations. | 9100 | http://formidable.com/open-source/victory/ | 214 | | 9700 | 148 | javascript | Charts Library | 2014-08-08
pug | pugjs | Pug – robust, elegant, feature rich template engine for Node.js. | 20300 | pugjs.org | 244 | MIT License | 348000 | 253 | javascript | Template engine | 2012-02-07
hbs | pillarjs | Express view engine wrapper for Handlebars. | 1500 | pugjs.org | 44 | MIT License | | 25 | javascript | Template engine | 2013-08-25
moment | moment | Parse, validate, manipulate, and display dates in javascript. | 45900 | momentjs.com | 84 | | 2500000 | 590 | javascript | Date library | 2012-10-08
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
(8 rows)
```


<br>

**5. Get the `name` and the `release_date` of the libraries without a licence.**

<!-- Your Query Goes Here -->
```sql
SELECT name, release_date FROM jslibraries WHERE licence IS NULL;

name | release_date
---------+--------------
victory | 2014-08-08
moment | 2012-10-08
(2 rows)
```

<br>

**6. Get the `name` and the `stars` from all CSS Framework libraries.**

<!-- Your Query Goes Here -->
```sql
SELECT name, stars FROM jslibraries WHERE type = 'CSS Framework';

name | stars
------+-------
(0 rows)

```
<br>

**7. Get the `name` of the libraries where the main technology is Typescript.**

<!-- Your Query Goes Here -->

```sql

SELECT name FROM jslibraries WHERE main_technology = 'typescript';

name
-------------------
styled-components
ant-design
chakra-ui
solid
(4 rows)
```

<br>

**8. Get the `name` and the `type` of all the libraries with more than 1000 contributors.**

<!-- Your Query Goes Here -->
```sql
SELECT name, type FROM jslibraries WHERE contributors > 1000;

name | type
------------+--------------------
react | SPA library
ant-design | Components Library
bootstrap | CSS Framework
(3 rows)

```

<br>

**9. Get the total number of `stars` of all the libraries.**

<!-- Your Query Goes Here -->
```sql
SELECT SUM(stars) FROM jslibraries;

sum
--------
783300
(1 row)
```

<br>

**10. Get the average number of `contributors` for all the libraries.**

<!-- Your Query Goes Here -->
```sql
SELECT AVG(contributors) FROM jslibraries;

avg
----------------------
542.5384615384615385
(1 row)


```

<br>

**11. Update the `licence` field of the libriaries without a licence to store `'unknown'` instead of `NULL`.**

<!-- Your Query Goes Here -->
```sql

UPDATE jslibraries SET licence = 'unknown' WHERE licence IS NULL;
UPDATE 2

jslab=# SELECT name, licence FROM jslibraries WHERE licence = 'unknown';
name | licence
---------+---------
victory | unknown
moment | unknown
(2 rows)

```

<br>

**12. Update the `used_by` field of the libraries that don't have this information to store `'unknown'` instead of `NULL`.**

<!-- Your Query Goes Here -->
```sql
UPDATE jslibraries SET used_by = 0 WHERE used_by IS NULL;
UPDATE 2


name | owner | description | stars | url | releases | licence | used_by | contributors | main_technology | type | release_date
---------+----------------+-------------------------------------------------------------------------------------------+-------+--------------------------------------------+----------+---------+---------+--------------+-----------------+----------------+--------------
victory | FormidableLabs | A collection of composable React components for building interactive data visualizations. | 9100 | http://formidable.com/open-source/victory/ | 214 | unknown | 9700 | 148 | javascript | Charts Library | 2014-08-08
moment | moment | Parse, validate, manipulate, and display dates in javascript. | 45900 | momentjs.com | 84 | unknown | 2500000 | 590 | javascript | Date library | 2012-10-08
(2 rows)


```

<br>

**13. Update all the records to capitalize the string provided in the `main_technology` field.**

<!-- Your Query Goes Here -->
```sql
UPDATE jslibraries SET main_technology = INITCAP(main_technology);
UPDATE 13

<!-- Para confirmar se deu certo -->
SELECT DISTINCT main_technology FROM jslibraries;

main_technology
-----------------
Typescript
Javascript
(2 rows)

```

<br>

**14. Delete all the records where `licence` is `'unknown'`.**

<!-- Your Query Goes Here -->
```sql

DELETE FROM jslibraries WHERE licence = 'unknown';
DELETE 2

SELECT * FROM jslibraries WHERE licence = 'unknown';
name | owner | description | stars | url | releases | licence | used_by | contributors | main_technology | type | release_date
------+-------+-------------+-------+-----+----------+---------+---------+--------------+-----------------+------+--------------
(0 rows)


```

<br>

**15. Delete all the records with 10000 or less `stars`.**

<!-- Your Query Goes Here -->
```sql
DELETE FROM jslibraries WHERE stars <= 10000;
DELETE 1

SELECT * FROM jslibraries WHERE stars <= 10000;
name | owner | description | stars | url | releases | licence | used_by | contributors | main_technology | type | release_date
------+-------+-------------+-------+-----+----------+---------+---------+--------------+-----------------+------+--------------
(0 rows)


```

<br>

**16. Delete all the records with less than 100 `releases`.**

<!-- Your Query Goes Here -->
```sql
DELETE FROM jslibraries WHERE releases < 100;
DELETE 3

SELECT * FROM jslibraries WHERE releases < 100;
name | owner | description | stars | url | releases | licence | used_by | contributors | main_technology | type | release_date
------+-------+-------------+-------+-----+----------+---------+---------+--------------+-----------------+------+--------------
(0 rows)


```

<br>