Count in sql with group by - sql

Question

Table name: mytable
Id username pizza-id pizza-size Quantity order-time
--------------------------------------------------------------
1 xyz 2 9 2 09:00 10/08/2014
2 abc 1 11 3 17:45 13/07/2014
This is mytable which has 6 columns. Id is int, username is varchar, order-time is datetime and rest are of integer datatype.
How to count the number of orders with the following pizza quantities: 1, 2, 3, 4, 5, 6,7 and above 7?
Using a T-SQL query.
It would be very helpful If any one could help to me find the solution.

Answer 1

Try this !
SELECT COUNT(ID),CASE WHEN QUANTITY<7 THEN QUANTITY ELSE 'ABOVE7' END AS QUANTITIES
FROM mytable
GROUP BY CASE WHEN QUANTITY<7 THEN QUANTITY ELSE 'ABOVE7' END

Answer 2

Try
Select CASE WHEN Quantity > 7 THEN 'OVER7' ELSE Cast(quantity as varchar) END Quantity,
COUNT(ID) NoofOrders
from mytable
GROUP BY CASE WHEN Quantity > 7 THEN 'OVER7' ELSE Cast(quantity as varchar) END
or
Select
SUM(Case when Quantity = 1 then 1 else 0 end) Orders1,
SUM(Case when Quantity = 2 then 1 else 0 end) Orders2,
SUM(Case when Quantity = 3 then 1 else 0 end) Orders3,
SUM(Case when Quantity = 4 then 1 else 0 end) Orders4,
SUM(Case when Quantity = 5 then 1 else 0 end) Orders5,
SUM(Case when Quantity = 6 then 1 else 0 end) Orders6,
SUM(Case when Quantity = 7 then 1 else 0 end) Orders7,
SUM(Case when Quantity > 7 then 1 else 0 end) OrdersAbove7
from mytable

Answer 3

If the requirement is like count the number of orders with different pizza quantities and represent count of orders as : 1, 2, 3, 4, 5, 6,7 and consider all above order counts in new category : 'above 7' then you can use window function as:
select case when totalorders < = 7 then cast(totalorders as varchar(10))
else 'Above 7' end as totalorders
, Quantity
from
(
select distinct count(*) over (partition by Quantity order by Quantity asc)
as totalorders,
Quantity
from mytable
) T
order by Quantity
DEMO
Edit: if the requirement is like count the number of orders with pizza quantities: 1, 2, 3, 4, 5, 6,7 and consider all other pizza quantities in new category : 'above 7' then you can write as:
select distinct
count(*) over (
partition by Quantity order by Quantity asc
) as totalorders,
Quantity
from (
select
case when Quantity < = 7 then cast(Quantity as varchar(20))
else 'Above 7' end as Quantity, id
from mytable ) T
order by Quantity
DEMO