Read our blogs, tips and tutorials
Try our exercises or test your skills
Watch our tutorial videos or shorts
Take a self-paced course
Read our recent newsletters
License our courseware
Book expert consultancy
Buy our publications
Get help in using our site
551 attributed reviews in the last 3 years
Refreshingly small course sizes
Outstandingly good courseware
Whizzy online classrooms
Wise Owl trainers only (no freelancers)
Almost no cancellations
We have genuine integrity
We invoice after training
Review 30+ years of Wise Owl
View our top 100 clients
Search our website
We also send out useful tips in a monthly email newsletter ...
Speed comparison of temporary tables against table variables Part two of a five-part series of blogs |
---|
When you are programming in SQL, you often have the choice of using table variables or temporary tables. This blog considers whether one method is substantially quicker than the other (spoiler alert: not really).
|
What I've chosen to do is to generate a table containing Wise Owl life advice:
The advice becomes a bit repetitive, since it repeats after 3 rows. The idea is to ensure we have a couple of reasonably authentic columns of data.
The SQL queries used each include a variable setting the number of rows to be generated:
-- the number of rows to generate
DECLARE @max int = 100000
I'll try running the queries with this variable set to 100,000, 1 million, 3 million and 5 million. The query should count the number of rows for each type of advice to produce something like this:
Given the advice will be randomly generated in equal amounts, the frequencies should be similar!
Let's start with temporary tables ...
Parts of this blog |
---|
|
Some other pages relevant to the above blogs include:
Kingsmoor House
Railway Street
GLOSSOP
SK13 2AA
Landmark Offices
99 Bishopsgate
LONDON
EC2M 3XD
Holiday Inn
25 Aytoun Street
MANCHESTER
M1 3AE
© Wise Owl Business Solutions Ltd 2024. All Rights Reserved.