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Case Statement where one column is null

Posted on 2014-12-04
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Last Modified: 2015-01-23
I have two columns LOAN_CT and LOAN_BAL.
In the below statement I am needing to show '0' in LOAN_NO column row  if LOAN_BAL is null else count LOAN_CT.


 SUM( case when (Loan_Bal) > 0 then count(LOAN_CT) else 0 end) as "Count of Loans",
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Question by:leezac
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Expert Comment

by:sdstuber
ID: 40481093
please post sample data and expected output
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Expert Comment

by:sdstuber
ID: 40481098
I don't understand this - >  LOAN_NO column row

what is LOAN_NO? how does it relate to the rest of the sql

what do you mean by "column row" ?

sample data and expected output should help immensely
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Expert Comment

by:slightwv (䄆 Netminder)
ID: 40481103
To get a 0 when there is a null use: NVL(some_column,0)

I'm not understanding what you really want here.
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Accepted Solution

by:
leezac earned 0 total points
ID: 40481139
LOAN_NO should be LOAN_CT.

I have values showing in LOAN_CT  1 when there is not a loan balance in LOAN_BAL column.  Should be 0.  Can I add a case statement to show it as 0

LOAN_BAL                  LOAN_CT

0                                          1

I am now updating the table but want to show in results.  May not be able to do - just asking.
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Expert Comment

by:sdstuber
ID: 40481145
case when loan_bal = 0 then 1 else loan_ct end loan_ct
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Assisted Solution

by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 664 total points
ID: 40481154
Maybe this?
 SUM( case when (Loan_Bal) > 0 then 1 else 0 end) as "Count of Loans",
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Assisted Solution

by:jsaun
jsaun earned 668 total points
ID: 40481248
From context, I'm guessing that he's trying to get a count of loans where balance is not NULL (BTW, a loan balance should probably never be NULL, only zero.  NULL makes no sense in this context)

If that's the case, then it would be
SELECT COUNT(1)
from LOANS
WHERE Loan_Bal > 0;
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Assisted Solution

by:awking00
awking00 earned 668 total points
ID: 40483062
You've provided one simple example but, since you question stated the "case statement where one column is null" even though it may not be realistic for a null LOAN_BAL or even a null LOAN_CT, the possibilities potentially exist that LOAN_BAL could be null, 0 or greater than 0 and LOAN_CT could be null, 0, 1, or greater than 1 so data like the following might be  possible:
LOAN_BAL  LOAN_CT
null               null
null               0
null               1
null               5
0                  null
0                  0
0                  1
0                  5
200              null
200              0
200              1
200              5
Please indicate if any of these possibilities can not exist and what you would expect as results from those possibilities than can.
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Author Closing Comment

by:leezac
ID: 40566019
I agree with all of the solutions presented - thank you.
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