Question

I’d like to know what does this operator do, I coundn’t find anything about it.
It would be nice to see some examples of usage.

set ansi_nulls [on | off]
expression !> expression (NULL)

For example: these queries return the same result (1):

select 1 where 1 !> 1;

select 1 where 1 = 1;

But nothing is returned from these queries:

set ansi_nulls off;
select 1 where null !> null;

set ansi_nulls on;
select 1 where null !> null;

Answer 1

Its stating “Not greater than“.

For example:

IF 1 !> 2
BEGIN
    PRINT 'foo'
END

This query will PRINT “foo”, because 1 is not greater than 2.

---

1 is not greater than 1, therefore this returns true.

Also 1 equals 1, so this will also return true.

Hence why both your statements return the same results.

---

Nothing will be returned when comparing null because these do not have a value. (ie. null != null). So the statement will never be true