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 have to filter out rows from a table say A (contains only 1 column ) that are not present in table B (contains many columns).
Apart from the only column in table A there is no other column that I can use.
So I am currently using the NOT IN clause but it is taking too much time to execute.
No room for Joins due to single common column
Please suggest your views
NOT IN(as well as<>for example) cannot be optimized with B-Tree organized indexes. So unfortunately you cannot do anything with this issue.