I need to achieve this next SQL query using the Exposed framework from Jetbrains
select r.name
from recipes r
inner join ingredient_index i on i.recipe_id = r.recipe_id
where i.ingredient_id IN (7, 5)
GROUP BY r.name
HAVING COUNT(*) = 2
This is taken directly from this answer, and the result from the query in native SQL is exactly what I'm looking for, but I'm using Exposed framework on my backend.
Stackoverflow question
I'm having issues with the last part HAVING COUNT(*) = X
I see there's a method I can use that's query.having { } but I don't see how I could implement the COUNT(*) = X inside that expression.
Any help is appreciated.
Related
I wanted to know how to translate this sql query into django's object.filter method
SELECT "accounts_customuser"."id"
FROM "accounts_customuser"
INNER JOIN "accounts_customuser_groups"
ON ("accounts_customuser"."id" == "accounts_customuser_groups"."customuser_id")
INNER JOIN "auth_group"
ON ("auth_group"."id" = "accounts_customuser_groups"."group_id")
where ("auth_group.name" IS NOT NULL)
in an accounts application I made a custom user model, there is also the group model that comes into play
in the django doc I saw an example but I would like to know how to apply it well for my case
q1 = Entry.objects.filter(headline__startswith="What")
q2 = q1.exclude(pub_date__gte=datetime.date.today())
q3 = q1.filter(pub_date__gte=datetime.date.today())
thank for any help.
I'm developing an ASP .NET WEB API using entity framework. I have an SQL code which I have to rewrite in LINQ I tried different approaches but none did work. The code is as follows:
SELECT
Debit, Credit,
(SELECT SUM(q.debit - q.Credit)
FROM Qry013 q
WHERE q.AccountGuide = 'D23265D8-E39A-4AF0-B652-0608FA61A866'
AND q.EntryNumber <= qry013.EntryNumber
AND q.ID <= qry013.ID) AS balance,
ISNULL(Entryname, InvoiceName) AS source,
ISNULL(EntryNumber, BillNumber) ASTransactionNumber,
TBL001.CurrencyShortcut AS CurrencyName,
Qry013.Rate, CostCenterName, BranchName,
EntryNote
FROM
Qry013
INNER JOIN
TBL001 ON TBL001.CardGuide = Qry013.CurrencyGuide
WHERE
AccountGuide = 'D23265D8-E39A-4AF0-B652-0608FA61A866'
AND Posted = 1
Everything might seem easy but that part where there is a nested SELECT with a SUM operation. I really appreciate your help
I solved this by adding a model class in which I defined the properties of the specific columns in the sql query and I used it as an object to populate the data in.
I am struggling with conversion to django query having raw sql
I am new in django and any help will be appreciated
There are simple models:
Winemaker - target model
Wine
Post
Winemaker has 1+ Wines
Wine has 1+ Posts
I know that it should be done with annotations but have no idea how to implement it.
select w2.*,
(select count(wp.id)
from web_winemaker www
inner join web_wine ww on www.id = ww.winemaker_id
inner join web_post wp on ww.id = wp.wine_id
where
ww.status=20
and
wp.status=20
and
www.id = w2.id
) as wineposts_count,
(
select count(w.id)
from web_winemaker www1
inner join web_wine w on www1.id = w.winemaker_id
where
w.status=20
and www1.id = w2.id
) as wines_count
from web_winemaker w2;
You should be able to accomplish this with a Count aggregation expression in an annotate function. I took a guess at your related_name values on your relationship fields, so the following code may not plug in directly, but should give you an idea of how to do what you want.
from django.db.models import Count, Q
wine_makers = Winemaker.objects.annotate(
posts_count=Count(
'wine__post__id',
filter=Q(wines__status=20, wines__posts__status=20),
),
wines_count=Count(
'wines__id',
filter=Q(wines__status=20),
),
)
You may need to supply distinct=True depending on if you're crossing relationships.
I have a database that contains schemas for skus, kits, kit_contents, and checklists. Here is a query for "Give me all the SKUs defined for kitcontent records defined for kit records defined in checklist 1":
SELECT DISTINCT s.* FROM skus s
JOIN kit_contents kc ON kc.sku_id = s.id
JOIN kits k ON k.id = kc.kit_id
JOIN checklists c ON k.checklist_id = 1;
I'm using Django, and I mostly really like the ORM because I can express that query by:
skus = SKU.objects.filter(kitcontent__kit__checklist_id=1).distinct()
which is such a slick way to navigate all those foreign keys. Django's ORM produces basically the same as the SQL written above. The trouble is that it's not clear to me how to get all the SKUs not defined for checklist 1. In the SQL query above, I'd do this by replacing the "=" with "!=". But Django's models don't have a not equals operator. You're supposed to use the exclude() method, which one might guess would look like this:
skus = SKU.objects.filter().exclude(kitcontent__kit__checklist_id=1).distinct()
but Django produces this query, which isn't the same thing:
SELECT distinct s.* FROM skus s
WHERE NOT ((skus.id IN
(SELECT kc.sku_id FROM kit_contents kc
INNER JOIN kits k ON (kc.kit_id = k.id)
WHERE (k.checklist_id = 1 AND kc.sku_id IS NOT NULL))
AND skus.id IS NOT NULL))
(I've cleaned up the query for easier reading and comparison.)
I'm a beginner to the Django ORM, and I'd like to use it when possible. Is there a way to get what I want here?
EDIT:
karthikr gave an answer that doesn't work for the same reason the original ORM .exclude() solution doesn't work: a SKU can be in kit_contents in kits that exist on both checklist_id=1 and checklist_id=2. Using the by-hand query I opened my post with, using "checklist_id = 1" produces 34 results, using "checklist_id = 2" produces 53 results, and the following query produces 26 results:
SELECT DISTINCT s.* FROM skus s
JOIN kit_contents kc ON kc.sku_id = s.id
JOIN kits k ON k.id = kc.kit_id
JOIN checklists c ON k.checklist_id = 1
JOIN kit_contents kc2 ON kc2.sku_id = s.id
JOIN kits k2 ON k2.id = kc2.kit_id
JOIN checklists c2 ON k2.checklist_id = 2;
I think this is one reason why people don't seem to find the .exclude() solution a reasonable replacement for some kind of not_equals filter -- the latter allows you to say, succinctly, exactly what you mean. Presumably the former could also allow the query to be expressed, but I increasingly despair of such a solution being simple.
You could do this - get all the objects for checklist 1, and exclude it from the complete list.
sku_ids = skus.values_list('pk', flat=True)
non_checklist_1 = SKU.objects.exclude(pk__in=sku_ids).distinct()
I am trying to add the following custom sql to a finder condition and there is something not quite right.. I am not an sql expert but had this worked out with a friend who is..(yet they are not familiar with rubyonrails or activerecord or finder)
status_search = "select p.*
from policies p
where exists
(select 0 from status_changes sc
where sc.policy_id = p.id
and sc.status_id = '"+search[:status_id].to_s+"'
and sc.created_at between "+status_date_start.to_s+" and "+status_date_end.to_s+")
or exists
(select 0 from status_changes sc
where sc.created_at =
(select max(sc2.created_at)
from status_changes sc2
where sc2.policy_id = p.id
and sc2.created_at < "+status_date_start.to_s+")
and sc.status_id = '"+search[:status_id].to_s+"'
and sc.policy_id = p.id)" unless search[:status_id].blank?
My find statement:
Policy.find(:all,:include=>[{:client=>[:agent,:source_id,:source_code]},{:status_changes=>:status}],
:conditions=>[status_search])
and I am getting this error message in my log:
ActiveRecord::StatementInvalid (Mysql::Error: Operand should contain 1 column(s): SELECT DISTINCT `policies`.id FROM `policies` LEFT OUTER JOIN `clients` ON `clients`.id = `policies`.client_id WHERE ((((policies.created_at BETWEEN '2009-01-01' AND '2009-03-10' OR policies.created_at = '2009-01-01' OR policies.created_at = '2009-03-10')))) AND (select p.*
from policies p
where exists
(select 0 from status_changes sc
where sc.policy_id = p.id
and sc.status_id = '2'
and sc.created_at between 2009-03-10 and 2009-03-10)
or exists
(select 0 from status_changes sc
where sc.created_at =
(select max(sc2.created_at)
from status_changes sc2
where sc2.policy_id = p.id
and sc2.created_at < 2009-03-10)
and sc.status_id = '2'
and sc.policy_id = p.id)) ORDER BY clients.created_at DESC LIMIT 0, 25):
what is the major malfunction here - why is it complaining about the columns?
The conditions modifier is expecting a condition (e.g. a boolean expression that could go in a where clause) and you are passing it an entire query (a select statement).
It looks as if you are trying to do too much in one go here, and should break it down into smaller steps. A few suggestions:
use the query with find_by_sql and don't mess with the conditions.
use the rails finders and filter the records in the rails code
Also, note that constructing a query this way isn't secure if the values like status_date_start can come from users. Look up "sql injection attacks" to see what the problem is, and read the rails documentation & examples for find_by_sql to see how to avoid them.
Ok, I've managed to retool this so it is more friendly to a conditions modifier and I think it is doing the sql query correctly.. however, it is returning policies that when I try to list the current status (the policy.status_change.last.status) it is set to the same status used in the query - which is not correct
here is my updated condition string..
status_search = "status_changes.created_at between ? and ? and status_changes.status_id = ?) or
(status_changes.created_at = (SELECT MAX(sc2.created_at) FROM status_changes sc2
WHERE sc2.policy_id = policies.id and sc2.created_at < ?) and status_changes.status_id = ?"
is there something obvious to this that is not returning all of the remaining associated status changes once it finds the one in the query?
here is the updated find..
Policy.find(:all,:include=>[{:client=>[:agent,:source_id,:source_code]},:status_changes],
:conditions=>[status_search,status_date_start,status_date_end,search[:status_id].to_s,status_date_start,search[:status_id].to_s])