SQL University: Advanced Indexing – Indexing Strategies
Right, I know it’s Friday and everyone’s tired and looking forward to the weekend, but I do need to finish...
2011-11-11
1,596 reads
Gail Shaw
- Interests: Computer Graphics, Aikido, Roleplaying
SQL University: Advanced Indexing – Filtered Indexes
Welcome back to day 2 of Advanced Indexing. Today we’re going to look at a feature that was added in...
2011-11-09
1,945 reads
SQL University: Advanced indexing – Sorting and Grouping
Good day everyone and welcome to another week of SQL University. I know we’re getting close to the end of...
2011-11-07
2,702 reads
24 Hours of PASS Questions
I finally found the time to work through the questions from the 24 Hours of PASS session that I did....
2011-09-27
764 reads
Compiles and recompiles
I want to spend some time over the next few months looking at query compilation and the plan cache, and...
2011-08-16
3,820 reads
All about Execution Plans
Coming to the PASS Summit in October this year? Excellent!
I say excellent, because Grant (blog|twitter) and I are presenting a...
2011-08-09
780 reads
SQLSkills Immersion training in London
Just short of the winter solstice, I bailed out of a freezing cold Johannesburg for warmer climates; well, actually for...
2011-07-22
1,263 reads
Converting OR to Union
When I looked at indexing for queries containing predicates combined with OR, it became clear that the are some restrictive...
2011-07-05
1,665 reads
Are all updates split into delete-insert?
This should be another quick one.
Earlier I saw a forum post where someone asserted that SQL always executes an update...
2011-06-21
4,827 reads
T-SQL Tuesday: Disasters don’t just come in huge
So we’re supposed to talk about disasters we’ve had or discuss disaster recovery technologies. I’m going to take a slightly...
2011-06-14
743 reads
Blogs
T-SQL Tuesday #202 SQL Server Outage You’ll Never Forget: A Roundup
When I put together the invitation for T-SQL Tuesday #202, I wasn't sure what...
A Last Minute Trip to the EU
By Steve Jones
My life has some crazy travel stretches for sure. Between speaking, office visits, customer...
Part 3 of 3: Tuning DiskANN — R, Alpha, L, Beam Width, Recall and Latency
In Part 1, we saw how ‘Vamana’ represents vectors as nodes, connects them with...
Forums
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Question of the Day
ORDER BY alias
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) + 1Which of the following queries produces the expected ordering and why? (Select all correct) See possible answers