Using OVER() to Fix Bad Version Numbers
See how the OVER() clause was used in a live system to fix overlapping field version numbers.
Free-Con Pre-Con at the Pass Summit 2016
A free day of training on Monday, October 24 in Seattle this year. Join MCMs, MVPs, and Friends of Redgate for a free day of training.
In-Memory OLTP: Row Visibility in SQL Server’s MVCC
SQL Server's In-memory OLTP is fast, due to its multi-valued concurrency control (MVCC). MVCC avoids the need for locks by arranging for each user connected to the database to see a snapshot of the rows of the tables at a point in time, No changes made by the user will be seen by other users of the database until the changes have been completed and committed. It is conceptually simple but does the user always see the correct version of a row under all circumstances? Shel Burkow explains.
DELETE Operation in SQL Server HEAPs
You should stick to using tables in SQL Server, rather than heaps that have no clustered index, unless you have well-considered reasons to choose heaps. However, there are uses for heaps in special circumstances, and it is useful to know what these uses are, and when you should avoid heaps. Uwe Ricken explains, and demonstrates why you'd be unwise to use heaps rather than tables when the data is liable to change.
How to create a directory of object-level scripts using SQL Compare
It’s often useful to be able to create a directory of object-level scripts from an existing database, for example to put a database into version control, or search through a directory of scripts. In this simple ‘how to’ article, Feodor Georgiev expands on the four most common reasons, and shows how simple it is using SQL Compare.
SQL Server 2016 New Date Objects
SQL Server 2016 introduced three new objects to deal with the greater demand of data; John Miner takes a look at this new functionality.
Blogs
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Automatic Index Compaction
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Forums
SQL Art, Part 4: Happy 4th of July — A British DBA's Guide to Celebrating a War We Don't Talk About
Comments posted to this topic are about the item SQL Art, Part 4: Happy...
How We Handled a Vendor Retry That Loaded Twice in Snowflake
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Cognitive Coverage
Comments posted to this topic are about the item Cognitive Coverage
Question of the Day
Getting the Average
I have this data in the dbo.Commission table in a SQL Server 2022 database.
salesperson commission Brian 12 Brian 16 Andy 7 Andy 14 Andy 21 Steve 20 Steve NULLAll the data is a varchar, and I decide to run this query to get the totals for each salesperson.
SELECT SalesPerson
, AVG(TRY_PARSE(Commission AS int)) AS TotalCommission
FROM commission
GROUP BY SalesPerson
GO
What average commission is calculated for Steve? See possible answers