Running Difference Between Union & Join
In SQL or other databases, Union and Join both play the same role when we join two or more tables together in any kind of database such as MS SQL, MY SQL, Oracle, or other databases. But if write about speed or data load time, in a simple way, Union is faster than Join because of its nature. Just apply the select query by using UNION, it just binds all the data in a line according to the table data but Join works a little bit slower.
Why Join is Slower Than Union
Some additional syntax works in Join because Join works with some special syntax such as:
- Right Join
- Right Outer Join
- Left Join
- Left Outer Join
- Full Join
- Full Outer Join
- Inner Join