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# SQLite specific instructions | ||
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This exercise requires you set the `result` column of the `etl` table to the correct value based on the JSON object found in the `input` column. The keys in the result object must be sorted alphabetically. | ||
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## Table Schema | ||
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```sql | ||
CREATE TABLE "etl" ("input" TEXT, "result" TEXT); | ||
``` |
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# Instructions | ||
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Your task is to change the data format of letters and their point values in the game. | ||
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Currently, letters are stored in groups based on their score, in a one-to-many mapping. | ||
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- 1 point: "A", "E", "I", "O", "U", "L", "N", "R", "S", "T", | ||
- 2 points: "D", "G", | ||
- 3 points: "B", "C", "M", "P", | ||
- 4 points: "F", "H", "V", "W", "Y", | ||
- 5 points: "K", | ||
- 8 points: "J", "X", | ||
- 10 points: "Q", "Z", | ||
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This needs to be changed to store each individual letter with its score in a one-to-one mapping. | ||
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- "a" is worth 1 point. | ||
- "b" is worth 3 points. | ||
- "c" is worth 3 points. | ||
- "d" is worth 2 points. | ||
- etc. | ||
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As part of this change, the team has also decided to change the letters to be lower-case rather than upper-case. | ||
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~~~~exercism/note | ||
If you want to look at how the data was previously structured and how it needs to change, take a look at the examples in the test suite. | ||
~~~~ |
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# Introduction | ||
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You work for a company that makes an online multiplayer game called Lexiconia. | ||
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To play the game, each player is given 13 letters, which they must rearrange to create words. | ||
Different letters have different point values, since it's easier to create words with some letters than others. | ||
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The game was originally launched in English, but it is very popular, and now the company wants to expand to other languages as well. | ||
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Different languages need to support different point values for letters. | ||
The point values are determined by how often letters are used, compared to other letters in that language. | ||
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For example, the letter 'C' is quite common in English, and is only worth 3 points. | ||
But in Norwegian it's a very rare letter, and is worth 10 points. | ||
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To make it easier to add new languages, your team needs to change the way letters and their point values are stored in the game. |
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{ | ||
"authors": [ | ||
"Steffan153" | ||
], | ||
"files": { | ||
"solution": [ | ||
"etl.sql" | ||
], | ||
"test": [ | ||
"etl_test.sql" | ||
], | ||
"example": [ | ||
".meta/example.sql" | ||
], | ||
"editor": [ | ||
"data.csv" | ||
] | ||
}, | ||
"blurb": "Change the data format for scoring a game to more easily add other languages.", | ||
"source": "Based on an exercise by the JumpstartLab team for students at The Turing School of Software and Design.", | ||
"source_url": "https://turing.edu" | ||
} |
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UPDATE etl | ||
SET result = ( | ||
SELECT json_group_object(LOWER(value), TRIM(path, '$."') + 0) | ||
FROM ( | ||
SELECT value, path | ||
FROM json_tree(input) | ||
WHERE type = 'text' | ||
ORDER BY value | ||
) | ||
); |
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# This is an auto-generated file. | ||
# | ||
# Regenerating this file via `configlet sync` will: | ||
# - Recreate every `description` key/value pair | ||
# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications | ||
# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion) | ||
# - Preserve any other key/value pair | ||
# | ||
# As user-added comments (using the # character) will be removed when this file | ||
# is regenerated, comments can be added via a `comment` key. | ||
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[78a7a9f9-4490-4a47-8ee9-5a38bb47d28f] | ||
description = "single letter" | ||
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[60dbd000-451d-44c7-bdbb-97c73ac1f497] | ||
description = "single score with multiple letters" | ||
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[f5c5de0c-301f-4fdd-a0e5-df97d4214f54] | ||
description = "multiple scores with multiple letters" | ||
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[5db8ea89-ecb4-4dcd-902f-2b418cc87b9d] | ||
description = "multiple scores with differing numbers of letters" |
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{ | ||
"exercise": "etl", | ||
"comments": [ | ||
"Transforms a set of legacy Lexiconia data stored as letters per score", | ||
"to a set of data stored score per letter.", | ||
"Note: The expected input data for these tests should have", | ||
"integer keys (not stringified numbers as shown in the JSON below", | ||
"Unless the language prohibits that, please implement these tests", | ||
"such that keys are integers. e.g. in JavaScript, it might look ", | ||
"like `transform( { 1: ['A'] } );`" | ||
], | ||
"cases": [ | ||
{ | ||
"uuid": "78a7a9f9-4490-4a47-8ee9-5a38bb47d28f", | ||
"description": "single letter", | ||
"property": "transform", | ||
"input": { | ||
"legacy": { | ||
"1": ["A"] | ||
} | ||
}, | ||
"expected": { | ||
"a": 1 | ||
} | ||
}, | ||
{ | ||
"uuid": "60dbd000-451d-44c7-bdbb-97c73ac1f497", | ||
"description": "single score with multiple letters", | ||
"property": "transform", | ||
"input": { | ||
"legacy": { | ||
"1": ["A", "E", "I", "O", "U"] | ||
} | ||
}, | ||
"expected": { | ||
"a": 1, | ||
"e": 1, | ||
"i": 1, | ||
"o": 1, | ||
"u": 1 | ||
} | ||
}, | ||
{ | ||
"uuid": "f5c5de0c-301f-4fdd-a0e5-df97d4214f54", | ||
"description": "multiple scores with multiple letters", | ||
"property": "transform", | ||
"input": { | ||
"legacy": { | ||
"1": ["A", "E"], | ||
"2": ["D", "G"] | ||
} | ||
}, | ||
"expected": { | ||
"a": 1, | ||
"d": 2, | ||
"e": 1, | ||
"g": 2 | ||
} | ||
}, | ||
{ | ||
"uuid": "5db8ea89-ecb4-4dcd-902f-2b418cc87b9d", | ||
"description": "multiple scores with differing numbers of letters", | ||
"property": "transform", | ||
"input": { | ||
"legacy": { | ||
"1": ["A", "E", "I", "O", "U", "L", "N", "R", "S", "T"], | ||
"2": ["D", "G"], | ||
"3": ["B", "C", "M", "P"], | ||
"4": ["F", "H", "V", "W", "Y"], | ||
"5": ["K"], | ||
"8": ["J", "X"], | ||
"10": ["Q", "Z"] | ||
} | ||
}, | ||
"expected": { | ||
"a": 1, | ||
"b": 3, | ||
"c": 3, | ||
"d": 2, | ||
"e": 1, | ||
"f": 4, | ||
"g": 2, | ||
"h": 4, | ||
"i": 1, | ||
"j": 8, | ||
"k": 5, | ||
"l": 1, | ||
"m": 3, | ||
"n": 1, | ||
"o": 1, | ||
"p": 3, | ||
"q": 10, | ||
"r": 1, | ||
"s": 1, | ||
"t": 1, | ||
"u": 1, | ||
"v": 4, | ||
"w": 4, | ||
"x": 8, | ||
"y": 4, | ||
"z": 10 | ||
} | ||
} | ||
] | ||
} |
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DROP TABLE IF EXISTS "etl"; | ||
CREATE TABLE "etl" ( | ||
"input" TEXT, | ||
"result" TEXT | ||
); | ||
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.mode csv | ||
.import ./data.csv etl |
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"{""1"":[""A""]}","" | ||
"{""1"":[""A"",""E"",""I"",""O"",""U""]}","" | ||
"{""1"":[""A"",""E""],""2"":[""D"",""G""]}","" | ||
"{""1"":[""A"",""E"",""I"",""O"",""U"",""L"",""N"",""R"",""S"",""T""],""2"":[""D"",""G""],""3"":[""B"",""C"",""M"",""P""],""4"":[""F"",""H"",""V"",""W"",""Y""],""5"":[""K""],""8"":[""J"",""X""],""10"":[""Q"",""Z""]}","" |
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-- Schema: CREATE TABLE "etl" ("input" TEXT, "result" TEXT); | ||
-- Task: update the etl table and set the result based on the input field. The keys in the result object must be sorted alphabetically. |
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-- Setup test table and read in student solution: | ||
.read ./test_setup.sql | ||
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-- Test cases: | ||
INSERT INTO tests (name, uuid, | ||
input, expected) | ||
VALUES | ||
('single letter', '78a7a9f9-4490-4a47-8ee9-5a38bb47d28f', | ||
'{"1":["A"]}', | ||
'{"a":1}'), | ||
('single score with multiple letters', '60dbd000-451d-44c7-bdbb-97c73ac1f497', | ||
'{"1":["A","E","I","O","U"]}', | ||
'{"a":1,"e":1,"i":1,"o":1,"u":1}'), | ||
('multiple scores with multiple letters', 'f5c5de0c-301f-4fdd-a0e5-df97d4214f54', | ||
'{"1":["A","E"],"2":["D","G"]}', | ||
'{"a":1,"d":2,"e":1,"g":2}'), | ||
('multiple scores with differing numbers of letters', '5db8ea89-ecb4-4dcd-902f-2b418cc87b9d', | ||
'{"1":["A","E","I","O","U","L","N","R","S","T"],"2":["D","G"],"3":["B","C","M","P"],"4":["F","H","V","W","Y"],"5":["K"],"8":["J","X"],"10":["Q","Z"]}', | ||
'{"a":1,"b":3,"c":3,"d":2,"e":1,"f":4,"g":2,"h":4,"i":1,"j":8,"k":5,"l":1,"m":3,"n":1,"o":1,"p":3,"q":10,"r":1,"s":1,"t":1,"u":1,"v":4,"w":4,"x":8,"y":4,"z":10}'); | ||
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-- Comparison of user input and the tests updates the status for each test: | ||
UPDATE tests | ||
SET status = 'pass' | ||
FROM (SELECT input, result FROM "etl") AS actual | ||
WHERE (actual.input, json(actual.result)) = (tests.input, json(tests.expected)); | ||
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-- Write results and debug info: | ||
.read ./test_reporter.sql |
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-- Update message for failed tests to give helpful information: | ||
UPDATE tests | ||
SET message = 'Result for ' || actual.input || ' is: ' || actual.result || ', but should be: ' || tests.expected | ||
FROM (SELECT input, result FROM etl) AS actual | ||
WHERE actual.input = tests.input AND tests.status = 'fail'; | ||
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-- Save results to ./output.json (needed by the online test-runner) | ||
.mode json | ||
.once './output.json' | ||
SELECT name, status, message, output, test_code, task_id | ||
FROM tests; | ||
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-- Display test results in readable form for the student: | ||
.mode table | ||
SELECT name, status, message | ||
FROM tests; |
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-- Create database: | ||
.read ./create_fixture.sql | ||
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-- Read user student solution and save any output as markdown in user_output.md: | ||
.mode markdown | ||
.output user_output.md | ||
.read ./etl.sql | ||
.output | ||
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-- Create a clean testing environment: | ||
DROP TABLE IF EXISTS tests; | ||
CREATE TABLE IF NOT EXISTS tests ( | ||
-- uuid and name (description) are taken from the test.toml file | ||
uuid TEXT PRIMARY KEY, | ||
name TEXT NOT NULL, | ||
-- The following section is needed by the online test-runner | ||
status TEXT DEFAULT 'fail', | ||
message TEXT, | ||
output TEXT, | ||
test_code TEXT, | ||
task_id INTEGER DEFAULT NULL, | ||
-- Here are columns for the actual tests | ||
input TEXT NOT NULL, | ||
expected TEXT NOT NULL | ||
); |