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Is possible that : "SELECT COUNT (*) < SELECT COUNT (VALUE)?"

By : Yusri Yusron
Date : September 15 2020, 07:00 PM
like below fixes the issue COUNT(*) counts every record, while COUNT(value) only takes in account non-null values. For a given dataset, COUNT(*) cannot be smaller than COUNT(value), however it may be greater.
Consider the following dataset:
code :
select count(*), count(val) from t
count(*) | count(val)
-------: | ---------:
       3 |          2

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"Select count (*)" vs count of results from "Select 1" : which is more efficient way to get the rows

By : TomQuijote
Date : March 29 2020, 07:55 AM
this one helps. select count is faster - because the database only needs to return a single number rather than a potentially long list.

How do I Select "sales count" for each item and show as "popularity" in Select ALL "design"

By : mjsalvilla
Date : March 29 2020, 07:55 AM
it should still fix some issue I create a temporary table containing the sales totals (i.e. the "popularity") for each design, then I JOIN that to the designs table:
code :
SELECT * FROM designs d
    SELECT design, COUNT(*) AS popCount
    FROM sales
    WHERE paid = 1
    GROUP BY design
) s
ON d.id = s.design
WHERE d.status = 1


By : soser
Date : March 29 2020, 07:55 AM
help you fix your problem 1) group my data by an attribute and count how many elements are in each group.
GROUP BY function is not supported by DynamoDB at the moment. You need to Scan or Query the table and implement it yourself.

How to construct yql for "select count(DISTINCT user_id), count(*) from music group by gender"

By : Yael Sarusi
Date : March 29 2020, 07:55 AM
hope this fix your issue The problem is that you want two different counts at the same level (documents and unique users).
This can usually be solved by unique labelling using "as", but unfortunately we require a matching each for label which doesn't account for this case. I'll create a GitHub issue for that. That said, you can achieve this by writing it as two parallel groupings with matching each'es:
code :
all(all(group(gender) each(output(count())) as(documents))
    all(group(gender) each(group(user_id) output(count())) as(users)))

DataTable.Select("Bla='Blablabla'").Count Returns 'Count' is not a member of 'System.Array' Exception

By : Sandeep
Date : March 29 2020, 07:55 AM
Does that help I'm trying to access the Count Property on the array of rows returned by the datatables select method, this is after converting the Web Project to 3.5 , Use .Length instead.
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