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Found 1 result

  1. I've created a course utilization report which is made up of several different MySQL queries. As you know, if a row contains no data, the result is NULL. IFNULL works to combat that, but doesn't work if there is a GROUP BY clause (GROUP BY a.courseSection). So, I need to figure out how to get it to return zero when one of the rows is null. If you look at the line Average Student Drops in the screenshot, you see that there are two cells missing which is throwing off the data. For example, since 2015 is null, everything shifts to the left. Below is the query I am using; any help with this is greatly appreciated. SELECT AVG(drops) FROM ( SELECT IFNULL(COUNT(a.stuAcadCredID),0) as drops,YEAR(a.addDate) as year FROM stu_acad_cred a LEFT JOIN course_sec b ON a.courseSection = b.courseSection LEFT JOIN course c ON b.courseID = c.courseID WHERE a.status IN('D') GROUP BY a.courseSection ) stuDrops GROUP BY year DESC LIMIT 10
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