Question

I have a table like this

ID   Name    IsDeleted
1    Yogesh  Null
2    Goldy   1

Now when I run this query

select  * 
from tableName 
where IsDeleted <> 1

I should get ID 1 record, But I am not getting it,

But when I run this

select  * 
from tableName 
where IsDeleted is null

I get ID 1 record,

Why am I facing this behavior ??
Isn’t NULL <> 1 is a true statement in SQL ??

IsDeleted is a bit type field with Allow Null true

Answer 1

select * from table 
where COALESCE(IsDeleted, 0) <> 1 
-- or ISNULL instead of COALESCE. 
--ISNULL seems to be better in subqueries, but it's not ANSI SQL.

or

select * from table 
where IsDeleted <> 1 or IsDeleted IS NULL