Mat has been a Dba since 2007 working in the finance and ecommerce industries in South Wales, UK.

Identity Crisis

I’m sure most people have identity values lurking somewhere in their databases. In fact I would guess that most people...

2012-05-02 (first published: 2012-04-25)

2,482 reads

The first blog post….

Daunting! By way of introduction, I’m Mat This blog is mostly for myself, to document what I know and maybe...

2012-04-03

604 reads

I’m excited to announce the release of a new open-source project that fully automates...

One of my favourite features of SQL Server 2022 was the T-SQL Snapshot Backups....

I have said and written this many times: Redgate Software is the type of...

Comments posted to this topic are about the item ORDER BY alias

Comments posted to this topic are about the item Optional Parameter Plan Optimization in...

Comments posted to this topic are about the item AI Experience Gap that we...

There is a table tmp_tab:

CREATE TABLE tmp_tab (
id int,
val int
);

INSERT INTO tmp_tab VALUES
(1, 1),
(2, NULL),
(3, 3),
(4, 4),
(5, 5);

You want to order the rows ids by the following expression:

    ISNULL(val, id) + 1

Which of the following queries produces the expected ordering and why? (Select all correct)