What is the main difference between a UNION statement and a UNION ALL statement? 1. A UNION statement eliminates duplicate rows; a UNION ALL statement includes duplicate rows. 2. A UNION statement can be used to combine any number of queries; a UNION ALL statement can be used to combine a maximum of two queries. 3. A UNION statement can only combine queries that have parallel fields in the SELECT list; a UNION ALL statement can combine queries with differing SELECT list structures. 4. A UNION statement cannot be used with aggregate functions; a UNION ALL statement can be used with aggregate functions. 5. There is no difference between the two statements; they are interchangeable.
2 7649Post New Saman Bank Interview Questions
What are the possible values of the “position” attributes?
Tell me about your Family background
What is it 41 used for?
How to start mysql on valet?
How do I clean up sql server transaction log?
What is memory management handled on ios?
How to center the block-elements with css?
What is the use of 'using' declaration in c++?
What is coalesce in sql?
How can we access the data sent through the url with the get method?
What is header file in c?
Are negative numbers true in c?
How do modification-free enhancements work?
What is the use of interceptors in angular 4?
Why is javascript good for websites?