All Questions
14 questions
1
vote
0
answers
25
views
query customer retention over range
I am trying to find the best way to accomplish the following.
Get the beginning customer count, which carries from the previous day
Get New Customer count
Get the number of Customers who have not ...
- 111
0
votes
0
answers
202
views
MySQL Creating Unnecessary Sort Index When an Aggregate Query is a Subquery
I have a complicated aggregate query, using the functions SUM and GROUP_CONCAT, that starts returning results in a reasonable amount of time by itself. But when this query is wrapped in another query, ...
0
votes
3
answers
3k
views
I am trying to find the average of a COUNT request [closed]
I have completed the query below from an invoices table which gives me the total invoices attached to each house ID. So house_id 114 has 14 invoices attached to it. Is there a way to feed this result ...
- 13
0
votes
2
answers
73
views
Independent aggregation of related entities, while also sorting by related (in a single statement)
I have a model with books and authors, with a many-to-many relationship between them (because a book can have multiple authors, and an author can write multiple books) through a table which I've named ...
- 101
0
votes
1
answer
58
views
How to rank an aggregation in each newly formed group?
The problem below that I would like to solve sounds quite simple but it is quite difficult for me to arrive at the solution with SQL.
Let's say I have a simplified ERD that looks as follows:
This ...
- 101
0
votes
1
answer
47
views
Two aggregated sub queries wont run
I am having trouble with the below, I need to average two columns in a correlated subquery and I cannot get it to work, how do i get both aggregate sub queries to run then go through the outer query? ...
- 35
0
votes
0
answers
1k
views
MySQL How to get first row from subquery when using aggregate function
This is my Query:
SELECT
COUNT(runs_scored) - SUM(IF(extra_type_id = 4, 1, 0)) AS Balls,
SUM(runs_scored) + SUM(IF(extra_type_id IN (2 , 4),
extra_runs,
0)) AS Runs,
SUM(...
- 101
11
votes
2
answers
15k
views
How to combine ORDER BY and LIMIT with an aggregate function?
Here is a fiddle for my question.
I have a simple table layout:
class
person: belongs to a class
I want to select all classes, and for each class, I want the first two person identifiers of the ...
- 455
0
votes
1
answer
35
views
Using OLAP-specs to compute selective running totals
Let's say I have a table with columns id, subid, state, value, where (id, subid) is a unique tuple, state may be 0 or some value <> 0, and value is just some number. I want to build a query that ...
- 155
2
votes
4
answers
2k
views
Vendors with Most Invoices in State
I have the tables Vendors(VendorName, VendorID,...) and Invoices(InvoiceID,...) and I am trying to find vendors with the most invoices in their respective states. Please critique my work:
SELECT Max(...
- 875
1
vote
1
answer
3k
views
Postgres Nested WHEN Aggregate Function
In PostgreSQL (version 9.4) I am trying to construct a query to determine in various tranches how many times various numbers appear in the data set between ranges. When I query group-ing by "...
- 115
33
votes
1
answer
178k
views
Postgres error [column must appear in the GROUP BY clause or be used in an aggregate function] when sub query is used
I have two tables employee and phones. An employee can have 0 to n phone numbers. I want to list the employee names with their phone numbers. I am using the below query which runs fine.
SELECT ...
- 433
2
votes
1
answer
962
views
Select query for returning different data based on creation time
I have a view, which will select data from table reports. The select will filter the data based on multiple dates.
reports table: id, key_id, position, created_at
My select:
pr.key_id,
COALESCE(...
- 683
1
vote
1
answer
4k
views
How to get MySQL to iterate a subquery in an aggregate select?
Because the vocabulary describing what I'd like to do can be so disparate, I haven't had any luck figuring out why MySQL 5.6 is doing what it does.
Consider the following two simple queries:
#1
...
- 153