Getting ORA-01476: divisor is equal to zero error - sql

Question

I need to get the total volume for two quarters as the query is showing in CASE statements. The third CASE statement is meant to divide the total of the volume for each quarter by the total MK_VOL.
Now the issue is that the MK_VOL for each day is one value, so essentially I need to get the MAX of each day and then SUM for the whole quarter to get the MKT_SHARE (which is SUM of VOL divided by SUM of the MK_VOL). To reiterate, for MK_VOL, it's not just a case of getting the total for the whole quarter but the MAX of each day and then the total.
As you can see the MK_VOL is the same for 02-APR.
Now my third case statement is trying to do that and I get an error. This is what I need help with please or a better solution.
I have tried doing a sub query but that didn't work either.
Data Set below
DATE Client VOL MK_VOL
----------- -------- ----- -------
01-APR AB 2 45
02-APR AC 3 46
02-APR AG1 26 46
02-APR AG2 48 46
03-APR AD 4 47
06-SEP AF 5 48
07-SEP AF 8 50
Query Below
SELECT CLIENT
, SUM(CASE WHEN DATE BETWEEN '01-JUL-19' AND '30-SEP-19' THEN VOLUME END) AS Q3_VOLUME
, SUM(CASE WHEN DATE BETWEEN '01-APR-19' AND '30-JUN-19' THEN VOLUME END) AS Q2_VOLUME
, SUM(CASE WHEN DATE BETWEEN '01-JUL-19' AND '30-SEP-19' THEN VOLUME END) AS Q3_VOLUME
/ sum(DISTINCT CASE WHEN DATE BETWEEN '01-JUL-19' AND '30-SEP-19' THEN MKT_VOL END) AS MKT_SHARE
FROM TB1
WHERE TRADE_DATE BETWEEN '01-APR-19' AND '30-SEP-19'
GROUP BY CLIENT
The expected result should be total VOL / SUM (MAX(MK_VOL) for each client.

Answer 1

First, your problem here is not only you could not calculate values as you wanted them to be, you had a "ORA-01476: divisor is equal to zero error" error which means you had a zero value in your divisor. You have to fix it or at least you have to avoid it like i demonstrate below.
SELECT CLIENT
SUM(Q3_VOLUME)/SUM(CASE WHEN MKT_SHARE!=0 THEN MKT_SHARE END) V1,
SUM(Q2_VOLUME)/SUM(CASE WHEN MKT_SHARE!=0 THEN MKT_SHARE END) V2
FROM (
SELECT CLIENT,
DATE
SUM(CASE WHEN DATE BETWEEN '01-JUL-19' AND '30-SEP-19' THEN VOLUME END) AS Q3_VOLUME,
SUM(CASE WHEN DATE BETWEEN '01-APR-19' AND '30-JUN-19' THEN VOLUME END) AS Q2_VOLUME,
MAX(DISTINCT CASE WHEN DATE BETWEEN '01-JUL-19' AND '30-SEP-19' THEN MKT_VOL END) AS MKT_SHARE
FROM TB1
WHERE TRADE_DATE BETWEEN '01-APR-19' AND '30-SEP-19'
GROUP BY CLIENT,DATE
)
GROUP BY CLIENT

Answer 2

I guess you need max of mktvoulumes for each quarter to evaluate the ratio quarter wise. Is this what you want as below?
Select
CLIENT
, SUM(CASE WHEN DATE BETWEEN
'01-JUL-19' AND '30-SEP-19' THEN
VOLUME END) )
/(
MAX(CASE WHEN DATE BETWEEN
'01-JUL-19' AND '30-SEP-19' THEN
MKT_VOLUME END) ) AS Q1
, SUM(CASE WHEN DATE BETWEEN
'01-APR-19' AND '30-JUN-19' THEN
VOLUME END)
/
(
MAX(DISTINCT CASE WHEN DATE
BETWEEN
'01-JUL-19' AND '30-SEP-19' THEN
MKT_VOLUME END) ) AS Q2
From Table group by client