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 is an Identity property? An Identity Column in a table is a column What is the foreign key constraint and what is the need of it on a Table? Foreign key Foreign key is a field or combination What is the difference between the Database and Datawarehouse? Database It contains Normalized data Group of databases form Leave a Reply Cancel reply Your email address will not be published.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.