I need your help. I need an advanced Query to my database. Im showing part of my database following:
Place (id, name, address)
Local (id, place_id, name)
PlaceReservation(id, local_id, date)
Media_Place (id, place_id, type)
Now I need a query, which gets all places with logo, which have AT LEAST ONE local which hasn't been reserved on a specific day e.g: 2015-07-01.
Help me please, because I haven't an idea how to do it. I thought about an outer join but I don't know how use it.
I was trying by:
$query = 'SELECT DISTINC *,
(SELECT sum(po.rating)/count(po.id)
FROM "Place_Opinion" po
WHERE po.place_id = p.id AND po.deleted = false) AS rating,
mp.path as logo_path
FROM "Place" p
INNER JOIN "Media_Place" mp ON mp.place_id = p.id
JOIN Local ON Local.place_id = Place.id
LEFT JOIN (
SELECT id AS rr, local_id
FROM PlaceReservation
WHERE date_start = \'2015-07-01\') Reserved ON Reserved.local_id = Local.id
WHERE mp.type = ' . Model_Row_MediaPlace::LOGO_TYPE . '
AND mp.deleted = false
AND p.deleted = false
AND rr IS NULL';
Looking for things that do not exist in a database is usually very inefficient. But you can change the logic around by finding places that do have a booking for the specified date, then LEFT JOIN that to all places with a logo and filter out the records with a reservation:
SELECT DISTINCT p.*, po.rating, mp.path as logo_path
FROM "Place" p
JOIN "Media_Place" mp ON mp.place_id = p.id AND mp.deleted = false AND mp.type = ?
JOIN Local ON Local.place_id = p.id
LEFT JOIN (
SELECT id AS rr, local_id
FROM PlaceReservation
WHERE date_start = '2015-07-01') reserved ON reserved.local_id = Local.id
LEFT JOIN (
SELECT place_id, avg(rating) AS rating
FROM "Place_Opinion"
WHERE deleted = false
GROUP BY place_id) po ON po.place_id = p.id
WHERE p.deleted = false
AND reserved.rr IS NULL;
The average rating per places is calculated in a separate sub-query. The error you had was because you referenced the "Place" table (p.id) before it was defined. For simple columns you can do that, but for sub-queries you can't.
Related
I want to check that the poi_equipement table (relationship table) corresponds to the data in the data table (i.e. a two-way check)
https://dbfiddle.uk/gFMjbIpX
detect that wc (in poi_equipement) is extra (because it is not present in the data table) and that hotel is not in poi_equipement so it is absent compared to the data table
I don't understand why with the raquête except he just answers me hotel.
I want him to answer me hotel and wc.
select object from data where subject = 'url1'
except
select subject from poi_equipement inner join equipement on poi_equipement.equipement_id = equipement.id;
ideally I want to know when I have a difference in poi_equipement, in data or in the 2 tables
A full outer join will do
with params as (
select 'url1' as subject),
data_object as (
select d.object
from data d
join params prm
on d.subject = prm.subject),
equipment_subject as (
select e.subject
from poi_equipement pe
join poi p
on pe.poi_id = p.id
join equipement e
on pe.equipement_id = e.id
join params prm
on p.id_url = prm.subject)
select d.object as data,
e.subject as poi_equipment
from data_object d
full outer
join equipment_subject e
on d.object = e.subject
where d.object is null
or e.subject is null;
Result:
data |poi_equipment|
-----+-------------+
hotel| |
|wc |
You can remove where clause if you need to see which item is in both places.
In my below T-SQL Query I need to use EFP_MessageCenter.MessageSender from my main SELECT in the SELECT in my LEFT OUTER JOIN as the value where I have placed <MessageSenderInitials>.
When I set (EFP_MessageCenter_1.MessageSender = EFP_MessageCenter.MessageSender) or (EFP_MessageCenter_1.MessageSender = MessageSenderInitials) I get the error The multi-part identifier "EFP_MessageCenter.MessageSender" could not be bound.
How can I get this to work?
SELECT LOWER(EFP_MessageCenter.MessageSender) AS MessageSenderInitials
, MAX(SenderInfo.FullName) AS SenderFullName
, MAX(SenderInfo.ProfilePicture) AS SenderProfilePicture
, MAX(EFP_MessageCenter_Receiver.UserID) AS ReceiverID
, MAX(EFP_MessageCenter.MessageTimestamp) AS ChangeDate
, COUNT(DisplayCountSelect.Displayed) AS CountNonReadMessages
FROM EFP_MessageCenter_Receiver
INNER JOIN EFP_MessageCenter ON EFP_MessageCenter_Receiver.MessageID = EFP_MessageCenter.id
INNER JOIN EFP_EmploymentUser AS SenderInfo ON EFP_MessageCenter.MessageSender = SenderInfo.Initials
LEFT OUTER JOIN
(SELECT EFP_MessageCenter_Receiver_1.Displayed, EFP_MessageCenter_Receiver_1.UserID, EFP_MessageCenter_1.MessageSender
FROM EFP_MessageCenter AS EFP_MessageCenter_1
INNER JOIN EFP_MessageCenter_Receiver AS EFP_MessageCenter_Receiver_1 ON EFP_MessageCenter_1.id = EFP_MessageCenter_Receiver_1.MessageID
WHERE (EFP_MessageCenter_Receiver_1.Displayed = 0) AND (EFP_MessageCenter_Receiver_1.UserID = 65) AND (EFP_MessageCenter_1.MessageSender = '<MessageSenderInitials>'))
AS DisplayCountSelect
ON DisplayCountSelect.UserID = EFP_MessageCenter_Receiver.UserID
WHERE (EFP_MessageCenter_Receiver.UserID = 65) AND (EFP_MessageCenter.MessageType = 'SPECIFIC')
GROUP BY EFP_MessageCenter.MessageSender
ORDER BY ChangeDate DESC
I've made a slight refactor of your query and changed the outer join to an an outer apply
It's not going to be 100% working I'm sure but should allow you to tweak it and include the correlation you need to.
I suspect you could move the CountNonReadMessages to a count(*) in the apply and possibly remove the aggregation, but that's just a guess.
select Lower(mc.MessageSender) as MessageSenderInitials
, Max(s.FullName) as SenderFullName
, Max(s.ProfilePicture) as SenderProfilePicture
, Max(mr.UserID) as ReceiverID
, Max(mc.MessageTimestamp) as ChangeDate
, Count(s.Displayed) as CountNonReadMessages
from EFP_MessageCenter_Receiver mr
join EFP_MessageCenter mc on mr.MessageID = mc.id
join EFP_EmploymentUser eu on mc.MessageSender = eu.Initials
outer apply (
select mr.Displayed
from EFP_MessageCenter mcx
join EFP_MessageCenter_Receiver mrx on mcx.id = mrx.MessageID
where mrx.Displayed = 0
and mrx.UserId=mr.UserId
and mcx.UserID = 65 /* this should probably be correlated */
and mcx.MessageSender = '<MessageSenderInitials>'
) s
where mr.UserID = 65 and mc.MessageType = 'SPECIFIC'
group by mc.MessageSender
order by ChangeDate desc
We created a view in Postgres and I am getting strange result.
View Name: event_puchase_product_overview
When I try to get records with *, I get the correct result. but when I try to get specific fields, I get wrong values.
I hope the screens attached here can explain the problem well.
select *
from event_purchase_product_overview
where id = 15065;
select id, departure_id
from event_puchase_product_overview
where id = 15065;
VIEW definition:
CREATE OR REPLACE VIEW public.event_puchase_product_overview AS
SELECT row_number() OVER () AS id,
e.id AS departure_id,
e.type AS event_type,
e.name,
p.id AS product_id,
pc.name AS product_type,
product_date.attribute AS option,
p.upcomming_date AS supply_date,
pr.date_end AS bid_deadline,
CASE
WHEN (pt.categ_id IN ( SELECT unnest(tt.category_ids) AS unnest
FROM ( SELECT string_to_array(btrim(ir_config_parameter.value, '[]'::text), ', '::text)::integer[] AS category_ids
FROM ir_config_parameter
WHERE ir_config_parameter.key::text = 'trip_product_flight.product_category_hotel'::text) tt)) THEN e.maximum_rooms
WHEN (pt.categ_id IN ( SELECT unnest(tt.category_ids) AS unnest
FROM ( SELECT string_to_array(btrim(ir_config_parameter.value, '[]'::text), ', '::text)::integer[] AS category_ids
FROM ir_config_parameter
WHERE ir_config_parameter.key::text = 'trip_product_flight.product_category_flight'::text) tt)) THEN e.maximum_seats
WHEN (pt.categ_id IN ( SELECT unnest(tt.category_ids) AS unnest
FROM ( SELECT string_to_array(btrim(ir_config_parameter.value, '[]'::text), ', '::text)::integer[] AS category_ids
FROM ir_config_parameter
WHERE ir_config_parameter.key::text = 'trip_product_flight.product_category_bike'::text) tt)) THEN e.maximum_bikes
ELSE e.maximum_seats
END AS departure_qty,
CASE
WHEN now()::date > pr.date_end AND po.state::text = 'draft'::text THEN true
ELSE false
END AS is_deadline,
pl.product_qty::integer AS purchased_qty,
pl.comments,
pl.price_unit AS unit_price,
rp.id AS supplier,
po.id AS po_ref,
po.state AS po_state,
po.date_order AS po_date,
po.user_id AS operator,
pl.po_state_line AS line_status
FROM event_event e
LEFT JOIN product_product p ON p.related_departure = e.id
LEFT JOIN product_template pt ON pt.id = p.product_tmpl_id
LEFT JOIN product_category pc ON pc.id = pt.categ_id
LEFT JOIN purchase_order_line pl ON pl.product_id = p.id
LEFT JOIN purchase_order po ON po.id = pl.order_id
LEFT JOIN purchase_order_purchase_requisition_rel prr ON prr.purchase_order_id = po.id
LEFT JOIN purchase_requisition pr ON pr.id = prr.purchase_requisition_id
LEFT JOIN res_partner rp ON rp.id = po.partner_id
LEFT JOIN ( SELECT p_1.id AS product_id,
pav.name AS attribute
FROM product_product p_1
LEFT JOIN product_attribute_value_product_product_rel pa ON pa.prod_id = p_1.id
LEFT JOIN product_attribute_value pav ON pav.id = pa.att_id
LEFT JOIN product_attribute pat ON pat.id = pav.attribute_id
WHERE pat.name::text <> ALL (ARRAY['Date'::character varying, 'Departure'::character varying]::text[])) product_date ON product_date.product_id = p.id
WHERE (p.id IN ( SELECT DISTINCT mrp_bom_line.product_id
FROM mrp_bom_line)) AND p.active
ORDER BY e.id, pt.categ_id, p.id;
If I add new event_event or new product_product I'll get a new definition of row_number in my view, then the column ID of my view is not stable.
at least you can't use row_number as Id of the view,
If you insist to use row_number, you can use the Order By "creation DATE" by this way all new records will be as last lines in the view and this will not change the correspondency between ID (row_number) and other columns.
Hope that helps !
Very likely the execution plan of your query depends on the columns you select. Compare the execution plans!
Your id is generated using the row_number window function. Now window functions are executed before the ORDER BY clause, so the order will depend on the execution plan and hence on the columns you select.
Using row_number without an explicit ordering doesn't make any sense.
To fix that, don't use
row_number() OVER ()
but
row_number() OVER (ORDER BY e.id, pt.categ_id, p.id)
so that you have a reliable ordering.
In addition, you should omit the ORDER BY clause at the end.
Can the following be rewritten to be more efficient?
I would use EXISTS if I didn't need fields from country but I do need those fields, and am not sure how to write this to make it more efficient.
SELECT distinct
p.ProvinceID,
p.Abbv as RegionCode,
p.name as RegionName,
cn.Code as CountryCode,
cn.Name as CountryName
FROM dbo.provinces AS p
INNER JOIN dbo.Countries AS cn ON p.CountryID = cn.CountryID
INNER JOIN dbo.Cities c on c.ProvinceID = p.ProvinceID
INNER JOIN dbo.Listings AS l ON l.CityID = c.CityID
WHERE l.IsActive = 1 AND l.IsApproved = 1
There are two things to note:
You're joining to dbo.Listings which results in many records, so you need to use DISTINCT (usually an expensive operator)
For any tables with columns not in the select you can move into an EXISTS (but the query planner effectively does this for you anyway)
So try this:
SELECT
p.ProvinceID,
p.Abbv as RegionCode,
p.name as RegionName,
cn.Code as CountryCode,
cn.Name as CountryName
FROM dbo.provinces AS p
INNER JOIN
dbo.Countries AS cn
ON p.CountryID = cn.CountryID
WHERE EXISTS (SELECT 1 FROM
dbo.Listings l
INNER JOIN dbo.Cities c
on l.CityID = c.CityID
WHERE c.ProvinceID = p.ProvinceID
AND l.IsActive = 1 AND l.IsApproved = 1
)
Check the query plans before and after - the query planner might be smart enough to do this anyway, but you have removed your distinct
The following will often perform even better by providing the optimizer more useful information:
SELECT
p.ProvinceID,
p.Abbv as RegionCode,
p.name as RegionName,
cn.Code as CountryCode,
cn.Name as CountryName
FROM dbo.provinces AS p
INNER JOIN
dbo.Countries AS cn
ON p.CountryID = cn.CountryID
INNER JOIN (
SELECT
p.ProvinceID
FROM
dbo.Listings l
INNER JOIN dbo.Cities c
on l.CityID = c.CityID
WHERE l.IsActive = 1 AND l.IsApproved = 1
GROUP BY
p.ProvinceID
) list
on list.ProvinceID = p.ProvinceID
I need to group the query below by dda.LA and need to display all the columns listed in the select but almost none of them are aggregated. i don't know what the syntax to get around this is and i can not find a post that shows this syntax (most examples only have one table, two at tops).
Select dda.a,
dda.b,
dda.c,
dda.d,
dda.e,
dda.f,
dda.g,
dda.h,
dda.i,
dda.j,
dda.k,
dda.l,
dda.m,
dda.n,
dda.o,
dda.p,
dda.r,
dda.u,
dda.LA,
dd.aa,
coalesce(apn.apn,Pt.z) as abc,
coalesce(apn.v,Pt.y) as def,
'RFN' RowFocusIndicator ,
'SRI' SelectRowIndicator ,
'Y' Expanded ,
Convert(Int, Null) SortColumn
From dda (NoLock)
Inner Join dd (NoLock) On dda.d = dd.q and dda.e = dd.e
Left Outer Join apn (nolock) on dda.r = apn.r
Left Outer Join Pt (nolock) on dda.s = Pt.t
Where 1 = 1
And dda.u = (Select Min(c.w)
From c (NoLock)
Where c.x = dda.s)
Thanks!
Just add this to any column that you want to aggregate by:
AggregatedColumnName = Aggregation(fieldToAggregate) Over (Partition By dda.LA)
ex.
aCount = Count(dda.a) Over (Partition By dda.LA)