I am developing a web app with rails and postgres as a shooting range game backend. It has an endpoint to save players scores, which writes the scores to DB and returns the first three places and the players' ranks with some context around it: a place before and a place after. For example if a player has rank 23, the method should return 1st, 2nd, 3rd places, the player rank itself and also two records with ranks 22 and 24 besides it. I don't store the rank in the DB it is calculated dynamically using following sql query:
SELECT RANK() OVER(ORDER BY score DESC) AS place, name, score
FROM scores
WHERE game_id=? AND rules_version=? AND game_mode=?
LIMIT 10
POST request with following data:
{
"players": [
{ "name": "Jack", "score": 100, "local_id": 1, "stats": {}},
{ "name": "Anna", "score": 200, "local_id": 2, "stats": {}}
]
}
should return following result set:
{
"scores": [
{
"name": "Piter",
"place": 1,
"score": 800
},
{
"name": "Lisa",
"place": 2,
"score": 700
},
{
"name": "Philip",
"place": 3,
"score": 600
},
{
"name": "Max",
"place": 25,
"score": 204
},
{
"name": "Anna",
"place": 26,
"score": 200,
"local_id": 2
},
{
"name": "Ashley",
"place": 27,
"score": 193
}
{
"name": "Norman",
"place": 36,
"score": 103
},
{
"name": "Jack",
"place": 37,
"score": 100,
"local_id": 1
},
{
"name": "Chris",
"place": 38,
"score": 95
}
]
}
Every field except local_id and as I said place is stored in DB. I can't figure out the right sql query to do such select. Please help.
Related
I have a JSON type SQL column in SQL table as below example. I want the below code to be converted into separate columns such as drugs as table name and other attribute as column name, how can I use adf or any other means please guide. The below code is a single column in a table called report where I need to convert this into separate columns .
{
"drugs": {
"Codeine": {
"bin": "Y",
"name": "Codeine",
"icons": [
93,
103
],
"drug_id": 36,
"pathway": {
"code": "prodrug",
"text": "is **inactive**, its metabolites are active."
},
"targets": [],
"rxnorm_id": "2670",
"priclasses": [
"Analgesic/Anesthesiology"
],
"references": [
1,
16,
17,
100
],
"subclasses": [
"Analgesic agent",
"Antitussive agent",
"Opioid agonist",
"Phenanthrene "
],
"metabolizers": [
"CYP2D6"
],
"phenotype_ids": {
"metabolic": "5"
},
"relevant_genes": [
"CYP2D6"
],
"dosing_guidelines": [
{
"text": "Reduced morphine formation. Use label recommended age- or weight-specific dosing. If no response, consider alternative analgesics such as morphine or a non-opioid.",
"source": "CPIC",
"guidelines_id": 1
},
{
"text": "Analgesia: select alternative drug (e.g., acetaminophen, NSAID, morphine-not tramadol or oxycodone) or be alert to symptoms of insufficient pain relief.",
"source": "DPWG",
"guidelines_id": 362
}
],
"drug_report_notes": [
{
"text": "Predicted codeine metabolism is reduced.",
"icons_id": 58,
"sort_key": 58,
"references_id": null
},
{
"text": "Genotype suggests a possible decrease in exposure to the active metabolite(s) of codeine.",
"icons_id": 93,
"sort_key": 56,
"references_id": null
},
{
"text": "Professional guidelines exist for the use of codeine in patients with this genotype and/or phenotype.",
"icons_id": 103,
"sort_key": 50,
"references_id": null
}
]
}
Since this json is already in a SQL column, you don't need ADF to break it down to parts. You can use JSON functions in SQL server to do that.
example of few first columns:
declare #json varchar(max) = '{
"drugs": {
"Codeine": {
"bin": "Y",
"name": "Codeine",
"icons": [
93,
103
],
"drug_id": 36,
"pathway": {
"code": "prodrug",
"text": "is **inactive**, its metabolites are active."
},
"targets": [],
"rxnorm_id": "2670",
"priclasses": [
"Analgesic/Anesthesiology"
],
"references": [
1,
16,
17,
100
],
"subclasses": [
"Analgesic agent",
"Antitussive agent",
"Opioid agonist",
"Phenanthrene "
],
"metabolizers": [
"CYP2D6"
],
"phenotype_ids": {
"metabolic": "5"
},
"relevant_genes": [
"CYP2D6"
],
"dosing_guidelines": [
{
"text": "Reduced morphine formation. Use label recommended age- or weight-specific dosing. If no response, consider alternative analgesics such as morphine or a non-opioid.",
"source": "CPIC",
"guidelines_id": 1
},
{
"text": "Analgesia: select alternative drug (e.g., acetaminophen, NSAID, morphine-not tramadol or oxycodone) or be alert to symptoms of insufficient pain relief.",
"source": "DPWG",
"guidelines_id": 362
}
],
"drug_report_notes": [
{
"text": "Predicted codeine metabolism is reduced.",
"icons_id": 58,
"sort_key": 58,
"references_id": null
},
{
"text": "Genotype suggests a possible decrease in exposure to the active metabolite(s) of codeine.",
"icons_id": 93,
"sort_key": 56,
"references_id": null
},
{
"text": "Professional guidelines exist for the use of codeine in patients with this genotype and/or phenotype.",
"icons_id": 103,
"sort_key": 50,
"references_id": null
}
]
}
}
}
select JSON_VALUE(JSON_QUERY(#json,'$.drugs.Codeine'),'$.bin') as bin,
JSON_VALUE(JSON_QUERY(#json,'$.drugs.Codeine'),'$.name') as name,
JSON_VALUE(JSON_QUERY(#json,'$.drugs.Codeine'),'$.drug_id') as drug_id,
JSON_VALUE(JSON_QUERY(#json,'$.drugs.Codeine'),'$.icons[0]') as icon_1
'
You need to decide how to handle arrays, such as icons, where there are multiple values inside the same element.
References:
JSON_QUERY function
JSON_VALUE function
I have the following table with one row. I have tried to query this table to return authors under the age of 40 and have been unable to do so.
CREATE TABLE bookstuff (
data JSON
);
insert into bookstuff(data)
VALUES('
{
"the_books": {
"publishers": [
{
"name": "Dunder Mifflin",
"address": "Scranton, PA",
"country": "USA",
"CEO": "David Wallace"
},
{
"name": "Sabre",
"address": "Tallahassee, FL",
"country": "USA",
"CEO": "Jo Bennett"
},
{
"name": "Michael Scott Paper company",
"address": "Scranton, PA",
"country": "USA",
"CEO": "Michael Gary Scott"
},
{
"name": "Vance Refrigeration",
"address": "Scranton, PA",
"country": "USA",
"CEO": "Bob Vance"
}
],
"authors": [
{
"id": 1,
"name": "Michael Scott",
"age": 45,
"country": "USA",
"agentname": "Jan Levinson",
"books_written": "book1"
},
{
"id": 2,
"name": "Jim Halpert",
"age": 35,
"country": "USA",
"agentname": "Pam Beesly",
"books_written": "book3"
},
{
"id": 3,
"name": "Dwight Schrute",
"age": 40,
"country": "USA",
"agentname": "Angela Martin",
"books_written": "book2"
},
{
"id": 4,
"name": "Pam Halpert",
"age": 35,
"country": "USA",
"agentname": "Angela Martin",
"books_written": "book4"
}
],
"books": [
{
"isbn": "book1",
"title": "The Dundies",
"price": 10.99,
"year": 2005,
"publishername": "Dunder Mifflin"
},
{
"isbn": "book2",
"title": "Bears, Beets, Battlestar Galactica",
"price": 8.99,
"year": 2006,
"publishername": "Dunder Mifflin"
},
{
"isbn": "book3",
"title": "The Sabre Store",
"price": 12.99,
"year": 2007,
"publishername": "Sabre"
},
{
"isbn": "book4",
"title": "Branch Wars",
"price": 14.99,
"year": 2015,
"publishername": "Sabre"
}
]
}
}');
I have tried the following query to get the author's age
SELECT data->'the_books'->'authors'
FROM bookstuff
WHERE (data->'the_books'->'authors'->>'age')::integer > 40;
I expect it to return two values 'Jim halpert' and 'pam halpert' but instead I get no result back, not even null.
I have also tried this query, just to see if i could get anything back at all from the table and still no results:
SELECT data->'the_books'->'authors'
FROM bookstuff
where (data->'the_books'->'authors'->'name')::jsonb ? 'Michael Scott';
I'm new to postgresql, is there a different way I should be going about this?
Using json_array_elements:
select (v -> 'name')#>>'{}' from bookstuff b
cross join json_array_elements(b.data -> 'the_books' -> 'authors') v
where ((v -> 'age')#>>'{}')::int < 40
See fiddle
Another option, slightly more verbose:
select distinct(author->>'name') as author_name from
(select json_array_elements(b.data->'the_books'->'authors') author from bookstuff b) author
where (author->>'age')::int < 40
The distinct might be unnecessary if you really just have one database row and no duplicates in the authors array of that row.
Three considerations of why your final solution doesn't work
where filters out rows - this happens before the 'select'. the row contains everything in this case.
'?' predicate matches an array containing your choosen value "Does the key/element string exist within the JSON value?" You don't have a simple array here array->'key' doesn't pick that attribute into a new array
your select projection isn't called however it was it would contain the whole array (remember where doesn't transform just filters out rows)
I have two tables: users table with id, name columns and events table with id, content and userId columns.
I am trying to query a table that return joined information from these two tables with name and events columns where events would represent an array of content fields corresponding to a user.
This is the query I am running:
select
name, group_concat(content) as events
from
users
left join
events on id = userId
group by
userId
order by
id
However rows with null values are not being returned except of just one row. What am I doing wrong?
Users table
[
{
"id": 1,
"name": "Hugo Powlowski"
},
{
"id": 2,
"name": "Jeremy Littel II"
},
{
"id": 3,
"name": "Eleanor King"
},
{
"id": 4,
"name": "Rogelio Jacobson"
},
{
"id": 5,
"name": "Jerald Rowe PhD"
},
{
"id": 6,
"name": "Robyn Tromp"
},
{
"id": 7,
"name": "Norman Zboncak"
},
{
"id": 8,
"name": "Mr. Kristy Orn"
},
{
"id": 9,
"name": "Mrs. Olivia Trantow"
},
{
"id": 10,
"name": "Daniel Lebsack"
}
]
Events table
[
{
"eventId": 3,
"content": "hello",
"userId": 7
},
{
"eventId": 12,
"content": "rulsan berden",
"userId": 1
}
]
Joined table
[
{
"name": "Hugo Powlowski",
"events": "rulsan berden"
},
{
"name": "Jeremy Littel II",
"events": null
},
{
"name": "Norman Zboncak",
"events": "hello"
}
]
You should group by the column in the parent table, not the table being left joined, so that the values will never be null.
So change GROUP BY userid to GROUP BY users.id.
Try to use a nested SELECT, this should return null for the users without any event:
select
u.name,
SELECT(
group_concat(content)
FROM
events
WHERE
userId = u.id
) as events
from
users u
order by
u.id
This is my Apartment integrated with services
"id": 26,
"user_id": 1,
"title": "SAN MARINO",
"slug": "san-marino",
"rooms": 1,
"bathrooms": 1,
"beds": 1,
"squared_meters": 12,
"address": "San Marino, Carpi",
"latitude": "44.80924",
"longitude": "10.91565",
"image": "apartment_image/BMRQZSXLdWviqDwmHgqLzrmzG1hJzJGOq7DujnRB.jpg",
"is_visible": 1,
"floor": 1,
"price": 120,
"description": "2",
"created_at": "2022-02-21T21:41:53.000000Z",
"updated_at": "2022-02-21T21:41:53.000000Z",
"services": [
{
"id": 2,
"name": "Posto Macchina",
"slug": "posto-macchina",
"created_at": "2022-02-21T08:59:53.000000Z",
"updated_at": "2022-02-21T08:59:53.000000Z",
"pivot": {
"apartment_id": 26,
"service_id": 2
}
}
]
}
I use to filter my collection( $apartment_list = ApartmentResource::collection(Apartment::with(['services'])->get());)
using multiple WHERE, like this: $apartment_list = $apartment_list->where('rooms', '>=', $rooms);
How can i filter my Apartment refering to the pivot column service_id or services[id]?
There is filter method for the collection. You may create a callback for a single apartament and filter in any way you want:
$apartment_list->filter(function ($apartament) {
// ...
});
you can use try with this:
$serviceId = value_of_service_id;
$apartment_list = ApartmentResource::collection(Apartment:: whereHas('services', function ($q) use ($serviceId) {
$q->where('service_id', $serviceId);
})->get());
I need to filter the array of dictionary , but in my structure some of the values are null
"data": [
{
"date": "2019-04-12 00:00:00",
"points": 825,
"trips": [
{
"id": 108,
"trip_detail": “<null>”
}
},
{
"date": "2019-04-11 00:00:00",
"points": 2475,
"trips": [
{
"id": 73,
"trip_detail": {
"id": 53,
"score": 8.25,
"points": 825,
}
},
{
"id": 74,
"trip_detail": {
"id": 54,
"score": 8.25,
"points": 825,
}
},
so in the above result I need to remove the first array of dictionary as well as that array.
Use filter to loop over a collection and return an Array containing only those elements that match an include condition.