What is the difference between union and union all sql

Example: Consider the above two tables Student and Teacher. You can observer here, the result is a combination of both the tables. The only difference between Union and Union All is that Union All will not removes duplicate rows or records, instead, it just selects all the rows from all the tables which meets the conditions of your specifics query and combines them into the result table.

Login Sign Up. Courses Ask a Question. Please log in or register to add a comment. Please log in or register to answer this question. We cannot use the Order by clause with each Select statement. SQL Server can perform a sort in the final result set only. Suppose we want to perform the following activities on our sample tables. We can understand it easily with execution plan. In the following screenshot, we can see the Actual Execution plan.

I hope you found this article helpful. Feel free to provide feedback in the comments below. ID INT. Union All. Order by [ JobTitle ]. Author Recent Posts. Rajendra Gupta. Company Questions. Artificial Intelligence. Cloud Computing. Data Science. Angular 7. Machine Learning. Data Structures. Operating System. Computer Network. Compiler Design. Computer Organization. Discrete Mathematics. Ethical Hacking. Computer Graphics. Software Engineering.

Web Technology. Cyber Security. C Programming.