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My data set has a weight column and a variable of interest var1, for which I need to form a weighted average of all rows that satisfy either var1=1 and var1=2. Unfortunately I need to do this in SQL, where I have very limited knowledge. To compute the weighted average of all rows, I would write SUM(var1 * weight)/SUM(weight). But how can I do this computation for all rows where var1 IN (1,2)?
It seems like what you're looking for would be the following:
SELECT SUM(var1 * weight) / SUM(weight)
FROM sample
WHERE var1 in (1,2)
I created a dbfiddle where you can go and check it out.
https://www.db-fiddle.com/f/qytaC3augXijw956ReuYqb/1
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I have, for example, ten customers
each customer placed ten orders
I would like to make a query to get the last order for each customer.
I would like to have it as a Google formula
=query
But I don't know the select what I need to enter.
Try below formula-
={UNIQUE(A1:A),
MAP(UNIQUE(A1:A),LAMBDA(x,INDEX(SORT(FILTER(A1:C,A1:A=x),3,0),1,2))),
MAP(UNIQUE(A1:A),LAMBDA(x,INDEX(SORT(FILTER(A1:C,A1:A=x),3,0),1,3)))}
Edit: With QUERY() formula-
=QUERY(A1:C,"select A, max(B), max(C) where A is not null group by A label max(B) '', max(C) ''",0)
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SELECT Nimi
FROM Myyjad
WHERE Myyjad.KauplusID
IN (SELECT KauplusID
FROM Kauplused
WHERE Kauplused.Kauplus = [Kauplus?])
AND Myyjad.Vanus > 60
ORDER BY Myyjad.Vanus DESC;
The initial task is: By the name of the store (through the parametric window), display the names of the oldest customers of this store.
I need condition where Myyjad.Vanus is the biggest (I can't use MAX func).
Please check relationships in on the link below.
relationships
sample1
sample2
SELECT TOP 1 Nimi
FROM Myyjad
WHERE Myyjad.KauplusID
IN (SELECT KauplusID
FROM Kauplused
WHERE Kauplused.Kauplus = [Kauplus?])
ORDER BY Myyjad.Vanus DESC;
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i want to set a filter for my product list so when the user set the shop name is shows only the products of that selected shop and when he also sets the Price limit it show the products of that same selected shop but with that desired price limit too
my sql request is like this but they told me it's wrong :
select nom from produit where boutique_id=3 or ( boutique_id=3 and Prix<500)
if there is any way i can do what i need to do please tell me
Is this what you want?
select nom
from produit
where boutique_id = 3 and (Prix < ? or ? is null);
The ? is the placeholder for your price parameter.
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I have 2 tables: STORES & REPORTS. The common key is the store_id
See attached image...
I want to build an SQL statement in a way to give me the total (SUM) of daily sales, daily visits and daily questions for each store separately.
Is there any way to do that, in a way that I will be able to loop through (move.next) in each store so to have the totals of each one store in one line?
You can try this query --
select
s.store_name,
sum(r.[daily sales]) as [daily sales],
sum(r.[daily visits]) as [daily visits],
sum(r.[daily questions]) as [daily questions]
from
stores s
left outer join
reports r on s.stored_id = r.store_id
group by
s.store_name
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I have two approaches to get count of rows in a table in DB2.
One way is
SELECT COUNT(*) FROM Foo WHERE col1 = val1;
Another way is to count the results (number 1's list) which are retrived from following query with a method in my java code
SELECT 1 FROM Foo WHERE col1 = val1;
Here I will get the "list of number 1's" from second query and then get the size of that list in my java code to get count.
Can somebody explain which is most efficient way to get the rows count ?
select count is faster - because the database only needs to return a single number rather than a potentially long list.