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# Need SQL help

Posted on 2011-02-23
Medium Priority
228 Views
Have the following SQL queries that work fine

select COUNT(*) as AES_18
from students
where grade_level=4 AND Enroll_Status=0 AND SchoolID=5 AND home_room<>'SESO'
<td>~(AES_18)</td>

select COUNT(*) as AES_19
from Sections
where course_number=0400 AND termID=2000 AND SchoolID=5
<td>~(AES_19)</td>

I need to be able to use SQL to perform AES_18/AES_19
0
Question by:btcs1
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LVL 93

Expert Comment

ID: 34965275
``````SELECT
(select COUNT(*)
from students
where grade_level=4 AND Enroll_Status=0 AND SchoolID=5 AND home_room<>'SESO') /
(select COUNT(*)
from Sections
where course_number=0400 AND termID=2000 AND SchoolID=5) AS Result
``````
0

LVL 26

Expert Comment

ID: 34965307

select
(
select COUNT(*) as AES_18
from students
where grade_level=4 AND Enroll_Status=0 AND SchoolID=5 AND home_room<>'SESO'
/

select COUNT(*) as AES_19
from Sections
where course_number=0400 AND termID=2000 AND SchoolID=5)
0

LVL 6

Expert Comment

ID: 34967337
Please consider error handling also.
If the value of AES_19 is Zero, then we will have "Divide by zero error encountered" error.
0

LVL 93

Accepted Solution

Patrick Matthews earned 2000 total points
ID: 34968987
Handling the potential zero denominator (good catch!)...

``````DECLARE @numerator decimal(16, 4), @demoninator decimal(16, 4)

SET @numerator =
(select COUNT(*)
from students
where grade_level=4 AND Enroll_Status=0 AND SchoolID=5 AND home_room<>'SESO')

SET @denominator =
(select COUNT(*)
from Sections
where course_number=0400 AND termID=2000 AND SchoolID=5)

--If you want the result to be NULL:

SELECT CASE WHEN @denominator <> 0 THEN  @numerator / @denominator ELSE NULL END AS Result

--If you want the result to be zero:

SELECT CASE WHEN @denominator <> 0 THEN  @numerator / @denominator ELSE 0 END AS Result
``````
0

LVL 143

Expert Comment

ID: 36119873
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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