Introduction Every DML transaction reads the data before it makes any changes. Not only during a SELECT query, but when you run any DML statement, insert, update, or delete, SQL Server first fetches a bunch of pages into the buffer pool locating the desired rows and changes them while synchronously writing to the transaction log […]
2021-05-10
8,998 reads
How to extend the range of SQL code analysis, during database development, to include dynamic analysis of the database metadata. This will allow regular checks for problems with the design of your tables and indexes ("table smells") that can affect database performance and data integrity.
2021-05-10
In this tip we look at the Sequence Number feature in SQL Server and compare it to the use of identity columns.
2021-05-10
As SQL developers, we tend to think of performance tuning in terms of crafting the best table indices, avoiding scalar and table valued functions, and analyzing query plans (among other things). But sometimes going back to the spec and applying some properties of elementary math can be the best way to begin to improve performance of SQL queries which implement mathematical formulas. This article is a case study of how I used this technique to optimize my SQL implementation of the Inverse Simpson Index.
2021-05-07 (first published: 2019-09-12)
5,528 reads
With both personal experience and the real world evidence to back it up, Grant Fritchey says, unequivocally, a well-implemented DevOps process helps the organization. But it's not always easy to bridge a siloed organization, and sometimes organizations adopt DevOps for the wrong reasons.
2021-05-07
In this article we cover how to get started with MLflow using Azure Databricks which manages the end-to-end machine learning lifecycle.
2021-05-07
Before you alter a database object, you need to understand what other objects will be affected. This article shows how to generate a simple dependency diagram that reveals both those objects that reference the target object, and those referenced by it, and includes foreign key references, column references and all the other details you need.
2021-05-05
In this article, Chandra Kudumula shows how to use ML.NET to train a model for predicting costs from an insurance dataset.
2021-05-05
In this article, we examine how data changes are made against heaps.
2021-05-03
4,927 reads
How to use a SQL random data generator to fill SQL Server tables with realistic test data, to shift left database unit testing, integration testing and performance testing so that it is performed during the early stages of database development.
2021-05-03
By SQLPals
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I have this table in a SQL Server 2025 database:
CREATE TABLE [dbo].[CustomerOrder] ( [OrderID] [int] NULL, [CustomerID] [int] NULL, [total] [money] NULL ) ON [PRIMARY] GOWhat is returned from this code? (answers are for the sum and then the count)
SELECT SUM(total) AS sum,
COUNT(total) AS count
FROM dbo.CustomerOrder;
See possible answers