Final answer:
The difference is primarily in the syntax specific to a programming language: 'status!= 200' uses an inequality operator, while 'NOT status=200' uses a logical negation operator, but both evaluate to true if 'status' is not equal to 200.
Step-by-step explanation:
The difference between status!= 200 and NOT status=200 lies in the programming language and the context in which these expressions are used.
However, in many programming languages, '!=' is an inequality operator that returns true if the values on either side are not equal. On the other hand, 'NOT' is a logical operator that negates the result of the comparison. So, 'NOT status=200' translates to 'NOT (status is equal to 200)', which will also return true if 'status' is not equal to 200. If the context is a SQL query, 'NOT' is the correct operator to use, whereas '!=' would be used in many other programming languages like Python, JavaScript, or Java.