How to do a 'count' for several criteria at once - sqlite

I am very new to SQL and am using SQLite 3 to run basket analysis on sales data.
The relevant columns are the product ID, a unique transaction ID (which identifies the basket) and the product quantity. Where a customer has bought more than one product type, the unqiue transaction ID is repeated.
I am wanting to count the number of baskets where the customer has bought 1, 2, 3, 4, 5 and more than 5 items in order to analyse what percentage of customers only bought 1 item.
The code I am using is:
select count (*) as One from (select uniqID, sum(qty) as total from otcdata3 group by uniqID having total > 0) where total = 1;
select count (*) as Two from (select uniqID, sum(qty) as total from otcdata3 group by uniqID having total > 1) where total = 2;
select count (*) as Three from (select uniqID, sum(qty) as total from otcdata3 group by uniqID having total > 1) where total = 3;
select count (*) as Four from (select uniqID, sum(qty) as total from otcdata3 group by uniqID having total > 1) where total = 4;
select count (*) as Five from (select uniqID, sum(qty) as total from otcdata3 group by uniqID having total > 1) where total = 5;
select count (*) as Six from (select uniqID, sum(qty) as total from otcdata3 group by uniqID having total > 1) where total = 6;
select count (*) as Sevenplus from (select uniqID, sum(qty) as total from otcdata3 group by uniqID having total > 1) where total > 6;
This code does work but firstly, as you can see, it is rather unwieldy looking and secondly, the data comes out in the following format when I open it in Excel:
One
1353697
Two
483618
Three
166148
Four
76236
Five
35079
Six
18904
Sevenplus
27896
Ideally I would like the number of items along the top, with the number of baskets meeting that criteria underneath. Whilst I can obviously sort the problem out manually at the moment, I need to run similar analysis on a much bigger scale soon!
Any suggestions on how to write the code so that it structures it the way I want would be greatly appreciated!

This is what you are looking for:
select
case
when total=1 then 'One'
when total=2 then 'Two'
when total=3 then 'Three'
when total=4 then 'Four'
when total=5 then 'Five'
when total=6 then 'Six'
when total=7 then 'SevenPlus'
end,
count(total)
from
(select case when count(uniqID) <= 6 then count(uniqID) else 7 end as total from otcdata3 group by uniqID) as totals
group by total
order by total
This returns two columns, the first column is a text representing the number of items in the transaction, and the second column is the number of distinct purchases with that number of items.

Related

How to run ROWS UNBOUNDED PRECEDING on specific rows only

I have an SQL query that is calculating the running total of 2 columns. Every week, there is new data which will be added to DUMMY_TABLE and everytime when I run the running total for that table, it will calculate the running total of all preceding rows which I don't really need. I just need the running total for the data that has been newly inserted. It will be a waste of resource if I have to run the total of all previous rows. I would like to know if there is any way to return the running total only for the week newly inserted.
I tried to use where but it filters the data. The reason I am looking for this is if I have new data every week and the table is size of 10K records, the running total will re-calculate all the 10K records and the new data I inserted.
SELECT
RID,
FYFW,
VOL,
FAILED_VOL,
SUM(VOL) OVER (PARTITION BY RID, SUBSTR(TRIM(FYFW), 1, 4) ORDER BY RID,FYFW ROWS UNBOUNDED PRECEDING) AS YTD_VOL,
SUM(FAILED_VOL) OVER (PARTITION BY RID, SUBSTR(TRIM(FYFW), 1, 4) ORDER BY RID,FYFW ROWS UNBOUNDED PRECEDING) AS YTD_FAILED_VOL,
FROM DUMMY_TABLE
GROUP BY 1,2,3,4
ORDER BY 1,2;

SQLite Calculate sum outside group by

I'm trying to calculate the percentage of a customer has spent over the total sales value.
I have calculated the total sales value per customer using sum() and group by, but after I use group by, I cannot differentiate the total sales value and the individual total for each sustomer.
is there anyway i could get around this?
i got to here so far and dont know what to do next:
select c.firstname ||' '|| c.lastname as 'Ful name',
sum(total) as 'Sales value',
/*something to calculate percentage*/,
from invoice i inner join customer c on i.customerid = c.customerid
group by i.customerid order by sum(total) desc limit 5;
To calculate the simple sum over the entire table, move it into an independent subquery:
SELECT ...,
sum(total) / (SELECT sum(total) FROM invoice)
FROM ...;

Sqlite select different rows as one

I've been searching the page for possible solutions but I can't find it anywhere.. What I need is pretty simple I need multiple rows to be displayed into one. I have tried || + ||, etc.
select c_category_in, c_data_services, c_dispositivos, c_averia as 'Sub-Category', count() as 'Total'
from tickets
group by c_category_in,c_averia,c_data_services,c_dispositivos
having (Total > 1)
screenshot
Based on your comments I would recommend taking a UNION of two separate groupings:
Grouping the data by c_data_services
Grouping the data by c_dispositivos
This results in a SELECT as following:
select c_category_in, c_data_services as 'Sub-Category', count() as 'Total'
from tickets
group by c_category_in, c_data_services
having (Total > 1)
union all
select c_category_in, c_dispositivos as 'Sub-Category', count() as 'Total'
from tickets
group by c_category_in, c_dispositivos
having (Total > 1)
The COALESCE function returns the first non-NULL value:
SELECT c_category_in,
COALESCE(c_data_services, c_dispositivos) AS SubCategory,
COUNT(*) AS Total
FROM tickets
GROUP BY c_category_in, SubCategory
HAVING Total > 1

How to select data where sum is greater than x

I am very new to SQL and am using SQLite 3 to run basket analysis on sales data.
The relevant columns are the product ID, a unique transaction ID (which identifies the basket) and the product quantity. Where a customer has bought more than one product type, the unqiue transaction ID is repeated.
I am wanting to select only baskets where the customer has bought more than 1 item.
Is there any way on SQLite to select the unique transaction ID and the sum of the quantity, but only for unique transaction IDs where the quantity is more than one?
So far I have tried:
select uniqID, sum(qty) from salesdata where sum(qty) > 1 group by uniqID;
But SQLite gives me the error 'misuse of aggregate: sum()'
Sorry if this is a simple question but I am struggling to find any relevant information by googling!
Try
select uniqID, sum(qty) from salesdata group by uniqID having sum(qty) > 1
"where" cannot be used on aggregate functions - you can only use where on uniqId, in this case.
if you want to put any condition on the result you get with group by you must use having.
select uniqID, sum(qty) as sumqty from salesdata group by uniqID having sumqty > 1
you can put any of the condition with having normaly as in where.
having sumqty = 1 ,having sumqty < 1 ,having sumqty IN (1,2,3) etc..

How to count data where sum is greater than x

I am very new to SQL and am using SQLite 3 to run basket analysis on sales data.
The relevant columns are the product ID, a unique transaction ID (which identifies the basket) and the product quantity. Where a customer has bought more than one product type, the unqiue transaction ID is repeated.
I am wanting to count the number of baskets where the customer has bought 1 item.
So far I have tried select count(distinct uniqID) from salesdata having sum(qty) = 1;
But this brought up an error saying a GROUP BY clause is required before HAVING.
I then tried select count(distinct uniqID) from salesdata group by uniqID having sum(qty) = 1
SQlite accepted this, but returned me a list of just 1s, which isn't right either!
I then tried select count(uniqID) from salesdata group by qty having sum(qty) = 1
SQlite also accepted this but returned nothing at all.
Any ideas would be hugely appreciated!
E
Try something like this to retrieve every user which has more or equal than one item in his basket
select uniqID, sum(qty) as total from salesdata group by uniqID having total >= 1
if you want to have only the users which have 1 item in their baskets replace >=1 with =1
like:
select uniqID, sum(qty) as total from salesdata group by uniqID having total = 1
If you want the numbers of users with 1 item in their baskets you get this like this:
SELECT COUNT(*) FROM (select uniqID, sum(qty) as total from salesdata group by uniqID having total
= 1)
Selecting the number of baskets that have only one item. This will also filter out baskets with a quantity higher than one on one single item. If you don't want that, remove the WHERE qty = 1 part.
SELECT
COUNT(uniqID) FROM
(SELECT
uniqID, SUM(qty) AS total
FROM
salesdata
WHERE
qty = 1
GROUP BY
uniqID
HAVING
total = 1)

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