how to sum a column from one table and group the sum using data from column of another table

Question

I am really having problem trying to sum up a column of one table and then group it according to the data from another table. the only common key that they have is account number.

here is the scenario

table 1.

account_no  volume  read_date
1            32      12016
2            22      12016
3            20      12016
4            21      12016
5            54      12016
3            65      12016
7            84      12016
8            21      12016
9            20      12016
10           30      12016

=========================================================

table 2

account_no  Zone
1            A
2            A
3            B
4            B
5            A
3            A
7            B
8            B
9            C
10           C

Result

Zone Total
A     173
B     146
C     50

so far this is how my query goes

Select sum(volume) as Total, read_date as bDate 
GROUP BY bDate 
ORDER By bDate

it was able to sum all the volumes based on the read_date any help would be much appreciated...

Answer 1

You just have to JOIN the two tables together and do a GROUP BY Zone :

SELECT t2.Zone, SUM(volume) AS Total
FROM table1 AS t1
INNER JOIN table2 AS t2
ON t1.account_no = t2.account_no
GROUP BY t2.Zone

Answer 2

Try this, This will sum up based on read_dates and Zones

SELECT A.read_date
    ,B.Zone
    ,sum(A.volume) SumOfVolume
FROM @Table1 A
INNER JOIN @Table2 B ON A.account_no = B.account_no
GROUP BY A.read_date
    ,B.Zone

Answer 3

This can be done by using :

SELECT SUM(TBL1.Volume) AS Total, TBL2.Zone
FROM TABLE1 AS TBL1
INNER JOIN TABLE2 AS TBL3
ON TBL1.Account_No = TBL2.Account_No
GROUP BY TBL2.Zone