What diffrence bitween these two mysql operators

Question

Can any one tell me What diffrence bitween these two mysql operators :-

<=> and =

Both are getting same results. Are they same in use.

select s.dwt,s.shipnam from tbl_ship s
where s.dwt >= 1 and s.deleted = 'N'
and s.dwt = 11000
group by s.co_cod

and

select s.dwt,s.shipnam from tbl_ship s
where s.dwt >= 1 and s.deleted = 'N'
and s.dwt <=> 11000
group by s.co_cod

Thanks.

Answer 1

<=> is NULL-safe equal to operator.