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Add practice exercise: space-age (#107)
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‎config.json

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"prerequisites": [],
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"difficulty": 2
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},
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{
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"slug": "space-age",
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"name": "Space Age",
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"uuid": "09b96007-c782-4b5e-b929-48bab73b5f69",
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"practices": [],
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"prerequisites": [],
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"difficulty": 2
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},
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{
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"slug": "allergies",
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"name": "Allergies",

‎exercises/practice/space-age/.docs/instructions.md

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# Instructions
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Given an age in seconds, calculate how old someone would be on a planet in our Solar System.
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One Earth year equals 365.25 Earth days, or 31,557,600 seconds.
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If you were told someone was 1,000,000,000 seconds old, their age would be 31.69 Earth-years.
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For the other planets, you have to account for their orbital period in Earth Years:
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| Planet | Orbital period in Earth Years |
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| ------- | ----------------------------- |
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| Mercury | 0.2408467 |
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| Venus | 0.61519726 |
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| Earth | 1.0 |
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| Mars | 1.8808158 |
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| Jupiter | 11.862615 |
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| Saturn | 29.447498 |
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| Uranus | 84.016846 |
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| Neptune | 164.79132 |
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~~~~exercism/note
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The actual length of one complete orbit of the Earth around the sun is closer to 365.256 days (1 sidereal year).
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The Gregorian calendar has, on average, 365.2425 days.
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While not entirely accurate, 365.25 is the value used in this exercise.
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See [Year on Wikipedia][year] for more ways to measure a year.
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[year]: https://en.wikipedia.org/wiki/Year#Summary
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~~~~

‎exercises/practice/space-age/.docs/introduction.md

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# Introduction
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The year is 2525 and you've just embarked on a journey to visit all planets in the Solar System (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune).
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The first stop is Mercury, where customs require you to fill out a form (bureaucracy is apparently _not_ Earth-specific).
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As you hand over the form to the customs officer, they scrutinize it and frown.
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"Do you _really_ expect me to believe you're just 50 years old?
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You must be closer to 200 years old!"
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Amused, you wait for the customs officer to start laughing, but they appear to be dead serious.
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You realize that you've entered your age in _Earth years_, but the officer expected it in _Mercury years_!
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As Mercury's orbital period around the sun is significantly shorter than Earth, you're actually a lot older in Mercury years.
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After some quick calculations, you're able to provide your age in Mercury Years.
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The customs officer smiles, satisfied, and waves you through.
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You make a mental note to pre-calculate your planet-specific age _before_ future customs checks, to avoid such mix-ups.
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~~~~exercism/note
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If you're wondering why Pluto didn't make the cut, go watch [this YouTube video][pluto-video].
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[pluto-video]: https://www.youtube.com/watch?v=Z_2gbGXzFbs
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~~~~

‎exercises/practice/space-age/.meta/config.json

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{
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"authors": [
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"jimmytty"
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],
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"files": {
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"solution": [
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"space-age.sql"
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],
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"test": [
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"space-age_test.sql"
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],
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"example": [
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".meta/example.sql"
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]
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},
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"blurb": "Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.",
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"source": "Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial.",
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"source_url": "https://pine.fm/LearnToProgram/?Chapter=01"
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}

‎exercises/practice/space-age/.meta/example.sql

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DROP TABLE IF EXISTS planets;
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CREATE TEMPORARY TABLE planets (
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name TEXT UNIQUE NOT NULL,
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period REAL NOT NULL
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);
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INSERT INTO planets (name, period)
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VALUES ('Mercury', 0.2408467 ),
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('Venus' , 0.61519726),
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('Earth' , 1.0 ),
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('Mars' , 1.8808158 ),
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('Jupiter', 11.862615 ),
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('Saturn' , 29.447498 ),
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('Uranus' , 84.016846 ),
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('Neptune', 164.79132 );
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UPDATE "space-age"
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SET result = ROUND("space-age".seconds / 31557600.0 / planets.period, 2)
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FROM planets
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WHERE "space-age".planet = planets.name
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AND "space-age".result ISNULL
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;

‎exercises/practice/space-age/.meta/tests.toml

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[84f609af-5a91-4d68-90a3-9e32d8a5cd34]
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description = "age on Earth"
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[ca20c4e9-6054-458c-9312-79679ffab40b]
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description = "age on Mercury"
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[502c6529-fd1b-41d3-8fab-65e03082b024]
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description = "age on Venus"
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[9ceadf5e-a0d5-4388-9d40-2c459227ceb8]
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description = "age on Mars"
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[42927dc3-fe5e-4f76-a5b5-f737fc19bcde]
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description = "age on Jupiter"
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[8469b332-7837-4ada-b27c-00ee043ebcad]
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description = "age on Saturn"
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[999354c1-76f8-4bb5-a672-f317b6436743]
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description = "age on Uranus"
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[80096d30-a0d4-4449-903e-a381178355d8]
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description = "age on Neptune"
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[57b96e2a-1178-40b7-b34d-f3c9c34e4bf4]
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description = "invalid planet causes error"
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include = false
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comment = "error testing omitted on purpose"

‎exercises/practice/space-age/create_fixture.sql

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DROP TABLE IF EXISTS "space-age";
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CREATE TABLE "space-age" (
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planet TEXT NOT NULL,
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seconds INTEGER NOT NULL,
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result REAL
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);
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.mode csv
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.import ./data.csv "space-age"
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UPDATE "space-age" SET result = NULL;

‎exercises/practice/space-age/create_test_table.sql

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DROP TABLE IF EXISTS tests;
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CREATE TABLE IF NOT EXISTS tests (
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-- uuid and description are taken from the test.toml file
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uuid TEXT PRIMARY KEY,
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description TEXT NOT NULL,
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-- The following section is needed by the online test-runner
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status TEXT DEFAULT 'fail',
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message TEXT,
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output TEXT,
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test_code TEXT,
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task_id INTEGER DEFAULT NULL,
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-- Here are columns for the actual tests
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planet TEXT NOT NULL,
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seconds INTEGER NOT NULL,
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expected REAL
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);
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INSERT INTO tests (uuid, description, planet, seconds, expected)
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VALUES
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('84f609af-5a91-4d68-90a3-9e32d8a5cd34','age on Earth','Earth',1000000000,31.69),
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('ca20c4e9-6054-458c-9312-79679ffab40b','age on Mercury','Mercury',2134835688,280.88),
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('502c6529-fd1b-41d3-8fab-65e03082b024','age on Venus','Venus',189839836,9.78),
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('9ceadf5e-a0d5-4388-9d40-2c459227ceb8','age on Mars','Mars',2129871239,35.88),
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('42927dc3-fe5e-4f76-a5b5-f737fc19bcde','age on Jupiter','Jupiter',901876382,2.41),
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('8469b332-7837-4ada-b27c-00ee043ebcad','age on Saturn','Saturn',2000000000,2.15),
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('999354c1-76f8-4bb5-a672-f317b6436743','age on Uranus','Uranus',1210123456,0.46),
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('80096d30-a0d4-4449-903e-a381178355d8','age on Neptune','Neptune',1821023456,0.35);
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‎exercises/practice/space-age/data.csv

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"Earth",1000000000,""
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"Mercury",2134835688,""
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"Venus",189839836,""
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"Mars",2129871239,""
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"Jupiter",901876382,""
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"Saturn",2000000000,""
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"Uranus",1210123456,""
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"Neptune",1821023456,""

‎exercises/practice/space-age/space-age.sql

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-- Schema: CREATE TABLE "space-age" (
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-- planet TEXT NOT NULL,
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-- seconds INTEGER NOT NULL,
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-- result REAL
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-- );
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-- Task: update the space-age table and set the result based on planet
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-- and seconds.

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