ISNULL function is not working in sql server2005

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SQL-Server-2005

In my table has integer column for id

I am using Isnull() function for select maximum id like

SQL

select max(isnull(id,0))+1 from table

But it is not working. When the table is null it displays null null value.
I didn't know Why?

Please help me.

Posted 15-Aug-12 20:26pm

devausha

Updated 15-Aug-12 20:35pm

Mehdi Gholam

v2

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3 solutions

Solution 2

In your code, you select max(no records), which is (correctly) null.

Use isnull(max(id),0)+1

If the table is empty, max(id) will return null, and isnull will replace it by zero.

Hope this helps,

Pablo.

Posted 15-Aug-12 20:35pm

Pablo Aliskevicius

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Santhosh Kumar Jayaraman · Accepted Answer · 2012-08-15T20:34:00

Solution 1

SQL

select isnull(max(id),0)+1 from table

Posted 15-Aug-12 20:34pm

Santhosh Kumar Jayaraman

Comments

Mehdi Gholam 16-Aug-12 2:35am

5'ed

StianSandberg 16-Aug-12 2:39am

perfect :) 5'ed

Wendelius · Accepted Answer · 2012-08-15T20:38:00

Solution 4

If the table contans no records, your query will not return any result rows hence you're not getting any macimum value.

One way to do this is to use a scalar. So for example something like this:

SQL

select coalesce( (select max(id) from YourTable), 0)

Posted 15-Aug-12 20:38pm

Wendelius