Answer / pravin

It is not possible to compare two nulls with each other.
Still if we want to compare null then we have isnull
operator.

Answer / gaurav arora

The answer-6 is quite matching with my stuff. Let me clear
it in more writting:
1. When we compare two nulls then the result
always 'false'. The main reason is the null is not a value
its neither an empty nor a empty space, so the actual
result is null which places as null.
2. When we compare a null with another which has some value
like some int value then the result is false. The actual
result is false and not null.

Consider the following examples:

--null = null is null which is false
Declare @intNull1 int
Set @intNull1 =null
Declare @intNull2 int
Set @intNull2=null
If @intNull1=@intNull2
Print 'null = null is true'
Else
Print 'null = null is false'

--Now assign some value
Set @intNull1 = 1
If @intNull1=@intNull2
Print 'null = int value is true'
Else
Print 'null = int value is false'

Thanks,
Gaurav Arora
http://stuff4mdesktop.blogspot.com/

What is rowid in sql?

0 Answers  

---

What is the best sql course?

0 Answers  

---

What is the difference between alter trigger and drop trigger statements?

0 Answers  

---

write a query to delete similar records in same table

13 Answers   TCS,

---

how would you write a query to select all teams that won either 2, 4, 6 or 8 games? : Sql dba

0 Answers  

---

How to call a javascript function from pl sql?

0 Answers  

---

What is oracle and pl sql?

0 Answers  

---

what is meant by databases

4 Answers  

---

what is csv? : Sql dba

0 Answers  

---

How do you delete duplicates in sql query using rowid?

0 Answers  

---

What are the types of variables use in pl sql?

0 Answers  

---

Which are the different character-manipulation functions in sql?

0 Answers  

---