What are the basic rules to be followed when you are using SQL SET Operators? Posted in SQL Interview Questions by Chandrasekhar Raparthi On July 10, 2014. No comments Rules: Number of columns in all the result sets should be matched(same). Respective data types should be matched between all the result sets. Share this:GooglePinterestEmailTwitterLinkedInFacebook Tags:set operators,SQL Related Posts What are the properties of Relational Tables? Below are the list of 6 important properties of What is Self join and why do we need it? There is no special type of join called Self How to add 5 business days to all values of a date column? First of all do not get confused between 5 Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Notify me of follow-up comments by email. Notify me of new posts by email.