How to Query Data From SQL Server?

Question

I have a problem in query data from database to make report in VB.NET. I use the Business Object to do the report. And here is my example data:

_____________         


        

Answer 1

If I understood you correctly, this should do what you want:

SELECT  A.Id, 
        A.Item, 
        A.Unit, 
        CASE WHEN B.Id IS NOT NULL THEN 'Undefined' ELSE [Unit Price] END [Unit Price],
        A.Quantity,
        A.Amount
FROM (  SELECT  Id, Item, Unit,
                CAST(MIN([Unit Price]) AS VARCHAR(20)) [Unit Price], 
                SUM(Quantity) Quantity, SUM(Amount) Amount
        FROM YourTable
        GROUP BY Id, Item, Unit) A
LEFT JOIN ( SELECT Id
            FROM YourTable
            GROUP BY Id
            HAVING COUNT(DISTINCT [Unit Price]) > 1) B
    ON A.Id = B.Id

Added an sql fiddle for you to try. (Credit to @bonCodigo, since I based my fiddle on the one he already had, but with my code).

This is the result:

ID  ITEM        UNIT        PRICE       QUANTITY    AMOUNT
1   Gasoline    L           Undefined   90          539.9
2   Water       Bottle      5.00        20          99.9
3   Meat        Kg          14.90       15          223.5
4   Milk        Can         7.45        30          223.5

Answer 2

Try this code please,

select Id, item, unit, sum(quantity) totoal_Qt ,
sum(amount) total_Px  from td
group by id, item, unit
;

Results:

ID  ITEM        UNIT    TOTOAL_QT   TOTAL_PX
1   Gasoline    L       90          539.9
2   Water       Bottle  10          50
3   Meat        Kg      15          223.5
4   Milk        Can     30          223.5

SQLFIDDLE

---

EDIT Using CASE

This is the closest I could get. It is a nice question. +1 for that. So the flaw with this editted answer that it will show you 'Undefined' for one item that has multiple unit_prices, however it will not show the unit_price even one items's multipel entries have the same unit_price. Answer is in full ANSI syntax.

*SQLFIDDLE

Changed the sample data to test for various scenarios.

ID  ITEM    UNIT    UNIT_PRICE  QUANTITY    AMOUNT
1   Gasoline    L   2   10  20
1   Gasoline    L   2.5     20  50
2   Water   Bottle  5   10  50
3   Meat    Kg  14.9    15  223.5
1   Gasoline    L   8   50  400
4   Milk    Can     7.45    30  223.5
1   Gasoline    L   6.99    10  69.9
2   Water   Bottle  5   10  49.9

Query:

select distinct x.id, x.item, x.unit,
x.total_Qt, x.total_Amt,
case when x.unitPrice = 0
then 'Undefined'
else cast(y.unit_price as varchar(9))
end as UP
from(
select Id, item, unit, sum(quantity) total_Qt ,
sum(amount) total_Amt, 
case when count(unit_price)>1
then 0
else 1 
end unitPrice
from td
group by id, item, unit) as x
left join 
(select distinct id, item, unit, unit_price
 from td) as y
on x.id = y.id
and x.item = y.item
and x.unit = y.unit
;

Results:

ID  ITEM        UNIT    TOTAL_QT    TOTAL_AMT   UP
1   Gasoline    L       90          539.9       Undefined
2   Water       Bottle  20          99.9        Undefined
3   Meat        Kg      15          223.5       14.90
4   Milk        Can     30          223.5       7.45