Need to find the number of employee who are not in all department

All we need is an easy explanation of the problem, so here it is.

i have a table T1 which has two columns empname , department

every emp must be in 37 department , but there are some employee who are in less than 37 department .

I need to find the names of emp who are not in all 37 departments.

i’m using a query :

select empname from T1 having count (department) < 37;

but it is not giving me the desired output.

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

Unless you are e.g. counting or summing the entire contents of a table, aggregate functions will require a group by statement. For example, if you are aggregating by counting the number of departments by employee, you must tell it to group by employee

select empname, count(*)
from t1
group by empname
having count(*) < 37

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

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