Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I see a query like
select *
from Table1
group by Step
having count(*) % 2 = 1
What is the trick about having count(*) % 2 = 1
Can anyone explain?
edit: What are the common usage areas?
Well % is the modulo operator, which gives the remainder of a division so it would give 0 when the number is exactly divisible by 2 (even) and 1 when not (e.g. it is odd). So the query basically selects elements for which count is odd (as said above).