What is difference between != and <>?

Answer 1

Both are not equal to signs only.....we can use any of the symbol for not equal to

Answer 2

Just their appearance. They are interchangeable in any actual SQL code as they both symbolically represent 'not equal to'.

Answer 3

Yeap, both are "Not Equal" signs but on a normal practice i prefer to use <> in SQL and != in programming language like Java, C# Thats how its makes it easier to standardise query language!