Questions tagged [aggregate-functions]
Aggregate functions are a subset of SQL functions that compute a single value from multiple input rows, mostly used in `SELECT` queries with a `GROUP BY` clause. Practically all modern RDBMS feature aggregate functions. Typical examples include `COUNT()`, `SUM()`, `MIN()`, `MAX()`, and `AVG()`.
aggregate-functions
5,863
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Polars : output of aggregate function (sum)
When I make the sum of the "Price" column for a subset of rows, I get the correct answer.
ca = [df.filter((pl.col('Created') <= datum[j]) & (pl.col('Year') == jaar[j])).select(pl.sum('...
1
vote
2
answers
55
views
SQL filter rows by range overlap
I have a snowflake table that roughly resembles the below. I want to filter out all rows that have the same name, provider and an overlapping voltage range.
Before:
NAME
Provider
Min_Volt
Max_Volt
...
1
vote
1
answer
50
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how to calculate the amount?
In postgresql using query
WITH RECURSIVE rel_rec AS (
SELECT
1 AS depth,
*,
ARRAY[lvl] AS child_path
FROM types_of_work
WHERE parent_id IS NULL ...
- 27
0
votes
3
answers
52
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How to return multiple columns based on lowest score in table a, and join to flag eligibility in table b
I am wanting to return for each customer, the column names for the lowest 2 scoring products from Table A but only where the customer is eligible for that product which is indicated in Table B by a 1 ...
-1
votes
0
answers
18
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OTBI Data Model Dataset Join [closed]
I am newly introduced to OTBI due to work (about 2 months ago). I have some SQL knowledge, but I am at a loss on how to join to datasets I have.
I want to list my budget and expenses (see screenshot) ...
- 9
0
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0
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38
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How to make aggregate function value a permanent column value?
I have the following query which gives the current_rating value which I am after. However I am wondering how I then make this query update my table permanently so the current_rating value column ...
- 103
0
votes
3
answers
75
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Update a database table, to remove duplicates, with data from another table
Consider the following two tables. Val1, Val2, and Val3 are combined to make a unique code. These are then tied to "Items" from another table (not depicted here, but only referenced by ...
0
votes
1
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27
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$filter is not allowed or the syntax is incorrect
I have some customers details. The schema is as below:
const CustSchema=new Schema({
cust_name:{
type:String,
required:true
},
email:{
type:String,
...
- 75
0
votes
2
answers
46
views
How to use Enumerable.Aggregate without getting CS0411 error
There are two DTO records:
public record struct DateHour(int Hour, double? Value);
private record struct HourSnapshot(uint TotalSeconds, double? Value);
I have another method which works with enum. I ...
- 165
1
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0
answers
31
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Creating a custom aggregator in spark with window rowsBetween?
What I'm trying to do is use a window function to get the last and current row and do some computation on a couple of the columns with a custom aggregator. I have time series data with points that are ...
- 101
0
votes
1
answer
19
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Getting same aggregation value for all category
I have three table named Content, Reaction and ReactionTypes, the Content and ReactionTypes tables are connected to Reaction table using One to Many relationship. Now, Category and Score are the the ...
- 21
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1
answer
58
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How to order by SUM() DESC when using WITH ROLLUP?
I want to use SELECT WITH ROLLUP in MariaDB to get a summary row in the result set, but also order the remaining rows by SUM() DESC. How to best achieve this?
Using the example from the linked ...
- 148k
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3
answers
60
views
Mapping result of aggregate function with class in OOP
I have a scenario where I'm designing a class Student.
public class Student
{
int id;
string name;
string section;
int semester;
}
I have a scenario that I want to display the count ...
2
votes
1
answer
68
views
Discount accumulated negative sum from column
I have the following dataset in PostgreSQL 15:
Generate data
SELECT id, value, expected_output, comment
FROM (VALUES
(1, 0.89, 0.89, ''),
(2, 0.17, 0.17, ''),
(3, -0.30, 0, 'accum ...
- 133
1
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2
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48
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Aggregate multiple values in of javascript
I want to reduce an array of objects like this:
var data = [{
item: "Item 1",
pages: 30,
chapters: 3
},
{
item: "Item 1",
pages: 50,
chapters: 3
...
- 539