Microsoft Access 2010 Max query on Count results - ms-access

I need my access db i'm trying to use the Max function on the results of a Count function of a field
i couldn't find any way of doing it - not through the user interface and not through SQL query.
This is my screen:
in the screen i have the count function working properly
how can i run the Max function on the Count function results?


To "run the Max function on the Count function results" requires that you "roll up" your count results to a higher level of aggregation. Save your existing query as HallCounts and then create a new query that does something like
SELECT Country_Id, Max(CountOfHall_Id) AS MaxHallCount
FROM HallCounts
GROUP BY Country_Id;
Or, to select just the row(s) with the highest count, try something like this
SELECT * FROM HallCounts
WHERE CountOfHall_ID = (SELECT MAX(CountOfHall_ID) FROM HallCounts);


I would use the TOP 1 SQL and DESC function. Or in the designer view it's "Return".
For example:
SELECT TOP 1 the_column_to_display
FROM the_table
ORDER BY Count(the_column_to_count) DESC;

Related

MySQL - get max of sum function

I'm trying to get the maximum number to "max"
getting error:
Error Code: 1111. Invalid use of group function 0.000 sec
SELECT max(count(*)) as max
FROM ticket
group by fan_fan_id;
I'm not sure what is the problem here and I will be glad to get some help here - also I need to solve it without "limit 1" option

SQL does not allow nesting aggregate functions like the example you show.
The argument to an aggregate function must be a scalar expression, not an aggregate expression.
You can do what you want this way:
SELECT MAX(c) FROM (SELECT COUNT(*) AS c FROM ticket GROUP BY fan_fan_id) AS t;
Or an alternative is to sort by value descending, and return only the first count:
SELECT COUNT(*) AS c FROM ticket GROUP BY fan_fan_id ORDER BY c DESC LIMIT 1;

Trouble in SQL Summing a Word

I am trying to Sum() the column Status where Status = 'operational'. I am having trouble figuring out how to sum the actual word "operational".
I have tried multiple different variations of the statement below (the one I posted is the most basic form) but I get the error: data type varchar is invalid for sum operator.
Can anybody help?
SELECT SUM(status) As 'TotalOperationalSTIDevices'
FROM netinfo_device_details
WHERE LoopBackAddress LIKE '10.12%' AND Status = 'Operational'

Try
Select COUNT(*) As 'TotalOperationalSTIDevices' from netinfo_device_details where LoopBackAddress Like '10.12%' and Status = 'Operational'

You need to use COUNT:
SELECT COUNT(*) As TotalOperationalSTIDevices
FROM netinfo_device_details
WHERE LoopBackAddress LIKE '10.12%' AND Status = 'Operational';
The SUM aggregation function really does a SUM of a set of numbers. COUNT just counts the number of rows.
Since the actual content of the row is not relevant, you can use COUNT(*) instead of COUNT(status) if you want.

Count with ActiveRecordObject.select

I would like to do something like this
User.select("users.id, count(whatever) as test")
But rails return only the User.id without the count.
I can't use something like
User.count(whatever)
Because I use this select in a very complex SQL query. Is it possible to get the count value with select helper ?

Are you sure the following query returns User.id? Doesn't it throw an error saying "column is invalid in the select list because it is not contained in either an aggregate function or the group by clause":
User.select("users.id, count(whatever) as test")
Because you are using count you should also use group method as following:
User.select("users.id, count(whatever) as test").group("users.id, whatever")
Then your resultant array will contain users.id and count(whatever).

MySQL GROUP BY doesn't work when migrated to SQL Server 2012

I'm moving my Delphi application from MySQL to SQL server 2012. In MySQL I had this query:
SELECT *,(XS+S+M+L+XL+XXL+[1Size]+Custom) as Total FROM StockData
GROUP BY StyleNr,Customer,Color
ORDER BY StyleNr,Customer,Color
And it worked perfectly. But in Microsoft SQL Server 2012 this query says
Msg 8120, Level 16, State 1, Line 1
Column 'StockData.ID' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
If I change my query to:
SELECT *,([XS]+[S]+[M]+[L]+[XL]+[XXL]+[1Size]+[Custom]) total
FROM [dbo].[stockdata]
GROUP BY ID,StyleNr,Customer,Color
ORDER BY StyleNr,Customer,Color
Then I get this error:
Msg 8120, Level 16, State 1, Line 1
Column 'dbo.stockdata.XS' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
Any ideas?
Here is the table's design view:

SQL Server is working as expected. You must include all items in your SELECT list in either a GROUP BY or in an aggregate function:
SELECT *,(XS+S+M+L+XL+XXL+[1Size]+Custom) as Total
FROM StockData
-- GROUP BY ID,StyleNr,Customer,Color, XS,S,M,L,XL,XXL,[1Size],Custom
ORDER BY StyleNr,Customer,Color
Or you might be able to use:
SELECT StyleNr,Customer,Color, SUM(XS+S+M+L+XL+XXL+[1Size]+Custom) as Total
FROM StockData
GROUP BY StyleNr,Customer,Color
ORDER BY StyleNr,Customer,Color;

All columns in an aggregate query must either be used by an aggregate function or a group by. Try only selecting the columns you require rather than * I.e. select stylenr, customer, color, ([...] ) as Total from.
This is a SQL standard way of dealing with aggregates, you'd get a similar error in Oracle.

You can also use this approach:
with OrdinalOnGroup
(
SELECT
Ordinal = rank() over(partition by StyleNr, Customer, Color order by id)
, *, (XS+S+M+L+XL+XXL+[1Size]+Custom) as Total
FROM StockData
)
select *
from OrdinalOnGroup
where Ordinal = 1;
PARTITION BY denotes the grouping of related information, this is called windowing

Checksum of SELECT results in MySQL

Trying to get a check sum of results of a SELECT statement, tried this
SELECT sum(crc32(column_one))
FROM database.table;
Which worked, but this did not work:
SELECT CONCAT(sum(crc32(column_one)),sum(crc32(column_two)))
FROM database.table;
Open to suggestions, main idea is to get a valid checksum for the SUM of the results of rows and columns from a SELECT statement.

The problem is that CONCAT and SUM are not compatible in this format.
CONCAT is designed to run once per row in your result set on the arguments as defined by that row.
SUM is an aggregate function, designed to run on a full result set.
CRC32 is of the same class of functions as CONCAT.
So, you've got functions nested in a way that just don't play nicely together.
You could try:
SELECT CONCAT(
(SELECT sum(crc32(column_one)) FROM database.table),
(SELECT sum(crc32(column_two)) FROM database.table)
);
or
SELECT sum(crc32(column_one)), sum(crc32(column_two))
FROM database.table;
and concatenate them with your client language.

SELECT SUM(CRC32(CONCAT(column_one, column_two)))
FROM database.table;
or
SELECT SUM(CRC32(column_one) + CRC32(column_two))
FROM database.table;