Implied Predicate and Partition Elimination
Erik Darling's delighted to see that SQL Server does some creative partition elimination.
2017-11-24
2,971 reads
Additional Articles
Dynamic Data Masking on Azure SQL Database
Azure SQL Database’s Dynamic Data Masking (DDM) feature limits the exposure of sensitive information to non-privileged users. DDM can mask either the full value or partial value in a column. This method can also mask Social Security and Credit Card Numbers without making any changes to the application.
2017-11-22
2,211 reads
More SQL Server Features that Time Forgot
SQL Server produces some great features, but it would be impossible to get them spot-on target every time. We are now quietly advised to use caution about using some of them, such as AutoShrink or the Index Advisor. Others, like the database diagramming tool, almost seem to have been quietly abandoned. Robert Sheldon investigates.
2017-11-21
4,678 reads
Importing Historical Stock Prices from Yahoo Finance into SQL Server
Rick Dobson demonstrate a clean end-to-end solution for importing historical stock ticker prices from Yahoo Finance into a SQL Server table using Python.
2017-11-20
2,351 reads
Questions About RDS SQL Server That You Were Too Shy to Ask
There are a number of different ways that you can host SQL Server. RDS SQL Server, for example, uses SQL Server within AWS as a simple database service, much like a more versatile alternative to MySQL. Obviously, it is a compromise, in that you lose many of the extras beyond the database. Laerte Junior answers those questions about RDS that people seem to assume you know the answers to, but which you may be too shy to ask.
2017-11-17
3,241 reads
Cleanly Uninstalling Stubborn SQL Server Components
There is a built-in command called msiexec which has an uninstall parameter (-x). This command can be used to remove stubborn programs through brute force. First, though, you need to get an inventory of the GUIDs that represent the programs you need to remove.
2017-11-16
2,852 reads
Consuming hierarchical JSON documents in SQL Server using OpenJSON
Over the years, Phil was struck by the problems of reading and writing JSON documents with SQL Server, and wrote several articles on ways of overcoming these problems. Now that SQL Server 2016 onwards has good JSON support, he thought that the articles would be forgotten. Not so, they continue to be popular, so he felt obliged to write about how you can use SQL Server's JSON support to speed the process up.
2017-11-15
3,562 reads
How to Do a Free SQL Server Health Check
Brent Ozar shares a free script that that you can run to quickly produce a health check of your SQL Server.
2017-11-14
5,245 reads
Missing Data
In the real world of business or scientific reporting and analysis, data can prove to be awkward. It can be plain wrong or it can be altogether missing. Sure, we have the NULL to signify unknown, but that doesn't play well with regular business reporting. There are a number of ways of dealing with missing information, and methods of estimating data from existing data has a long and respectable history. Joe Celko gets to grips with a data topic that is often treated with some trepidation.
2017-11-13
4,133 reads
Mixing MongoDB and Relational Databases in the Enterprise
Your Agile developers want MongoDB, or a similar document database: your Ops people are concerned about security and backup, and Governance are muttering about transactionality and data transfer between systems. Do you restrict your developers from rapidly-evolving the data design for their domain or do you embrace the joys of NoSQL unconditionally? If you accept a polyglot database environment, where the NoSQL lambs coexist with the relational lions, how do you provide tools and common database concepts that everyone can use and understand?
2017-11-10
3,389 reads
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Forums
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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