Learn about SQL Joins on Multiple Columns
Learn about joining SQL Server tables together for a query when there is a need to join on multiple columns.
2021-12-27
Articles
CData Connect: Derived Views and Query Federation
Enterprise-scale data integration demands scalable tools to not only centralize and curate data at scale, but also efficiently explore and analyze data at large-scale. CData Connect solves the challenge of data exploration and discovery through virtualized connectivity to data distributed across many data sources. In this article, we explore the Derived Views and Query Federation features […]
2021-12-24
492 reads
Query Performance Diagnostics with sp_PerfSQ
This article discusses sp_PerfSQ a diagnostic tool designed to quantify performance features of database queries with active requests. It includes a behavioural parser and can assist in troubleshooting complex performance issues.
2021-12-24 (first published: 2019-12-02)
11,421 reads
Bulk Loading Data via a PowerShell Script in Flyway
How to quickly and automatically bulk load test data once Flyway Teams completes a database migration. A baseline migration script creates the empty database version, which then triggers a PowerShell callback script that bulk loads in the right version of the data. It is a very fast way to provision multiple copies of a specific database version, complete with data, for ad-hoc or automated testing.
2021-12-24
Implementing Deduplication Logic in the Lakehouse using Synapse Analytics Mapping Data Flow
Learn how to perform data deduplication for Azure Synapse Analytics using Azure Mapping Data Flows.
2021-12-24
Adding Test Data to Databases During Flyway Migrations
How to add test data to a SQL Server database, during Flyway development. We use SQL Data Generator to produce some "realistic but fake" data and then SQL Data Compare to produce an INSERT script that Flyway can use to load the data into a newly-built version of the database.
2021-12-22
Unity state machine behaviours
Video games would not be much fun without animation. In this article, Lance Talbert demonstrates Unity state machine behaviours to define code running during specific animation states.
2021-12-22
Is SQL Server Profiler in Azure Data Studio?
Introduction Do we have the SQL Profiler in Azure Data Studio? In a previous article, we compared SSMS and Azure Data Studio. Now we will compare the new SQL Profiler against the old one. If you check the SQL Server Profiler documentation, you will find that SQL Profiler is deprecated and that that feature will […]
2021-12-20
5,043 reads
Why cloud and hybrid estates are important - but bring complexity
With 92% of organizations now reported to be multi-cloud, a well thought-out approach to cloud migration is imperative. Download our final insights report in this series on database monitoring to find out how 2500+ of your peers are dealing with the challenge.
2021-12-20
Working with PowerShell strings
Knowing how to manipulate strings is critical in any language. In this article, Greg Moore explains working with PowerShell strings.
2021-12-20
Blogs
T-SQL Tuesday #180: Good enough is perfect
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The pros and cons of self-service BI: What every industry leader should know
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Forums
What's New for the Microsoft Data Platform
Comments posted to this topic are about the item What's New for the Microsoft...
Using Outer Joins
Comments posted to this topic are about the item Using Outer Joins
Question of the Day
Using Outer Joins
I have this data in a SQL Server 2019 database:
Customer table CustomerID CustomerName 1 Steve 2 Andy 3 Brian 4 Allen 5 Devin 6 Sally OrderHeader table OrderID CustomerID OrderDate 1 1 2024-02-01 2 1 2024-03-01 3 3 2024-04-01 4 4 2024-05-01 6 4 2024-05-01 7 3 2024-06-07 8 2 2024-04-07I want a list of all customers and their order counts for a period of time, including zero orders. If I run this query, how many rows are returned?
SELECT c.CustomerName, COUNT(oh.OrderID) FROM dbo.Customer AS c LEFT JOIN dbo.OrderHeader AS oh ON oh.CustomerID = c.CustomerID WHERE oh.Orderdate > '2024/04/01' GROUP BY c.CustomerNameSee possible answers