In this free eBook, Kalen Delaney explains how Microsoft's 2016 In-memory OLTP engine works. In her book, learn how to use lock- and latch-free data structures to allow non-blocking data processing, and find out how to migrate existing tables to Hekaton.
2020-12-30 (first published: 2015-05-13)
55,467 reads
In this free eBook Shawn McGehee offers advice on query tuning, cutting stored procedures, and system process design and implementation for high availability. Discover how to perform backup and restore operations using SQL Server Management Studio (SSMS), basic T-SQL scripts and Redgate's SQL Backup tool.
2020-12-02 (first published: 2014-03-05)
80,501 reads
Download your free copy of SQL Server Transaction Log Management and see why understanding how log files work can make all the difference in a crisis.
2013-06-27
5,550 reads
By ReviewMyDB
Index maintenance has always meant nightly jobs and a window you have to defend....
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One of the things I’ve been requesting for a number of years is cost...
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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