Transact-SQL

SQLServerCentral Article

The difference between BIN2 and Case-Sensitive collations in SQL

  • Article

Here you will learn about the key differences between the binary and SQL/Windows collations. You will see that even with all sensitivity flags enabled, SQL/Windows collation cannot behave the same way as the binary collations.

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2024-03-15

1,421 reads

SQLServerCentral Article

GENERATE_SERIES() Breaks Minimal Logging

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tl;dr The title says it all. Prologue One of the keys to my personal learning is that, very early in my database career, I taught myself how to make lot’s of rows of Random Constrained Data in a comparatively short time. With the help of a few good folks over time, the method has been […]

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2023-09-18

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SQLServerCentral Article

Performance Tuning with SQLFacts Tools

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The need for performance tuning your SQL Server workloads has never been more critical. As workloads are moved into cloud services, their efficiency has a direct impact on the recurring bills. A workload that consumes more resources than necessary costs more to host in the cloud and affects the bottom line for your organization.

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2023-04-07

10,629 reads

SQLServerCentral Article

Manage Your Business Rules in T-SQL Query

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Motivation At some point in the carrer, we have come across the problem of hard-coded values in SELECT or WHERE clauses.  And we all agree that these hardcoded values must be parametrised. This bad habit usually backfires when we need to troubleshoot a query. These hardcoded values are usually a business role baked in the […]

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2022-10-18 (first published: )

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SQLServerCentral Article

Playing popular game of Wordle using T-SQL

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Popular and addictive game of Wordle is now written in Transact SQL script. With this script, you can now  play this game on Microsoft SQL Server, using your favourite editor - SSMS, ADS, VS Code, and enjoy playing the game during free time, or whilst waiting for the other SQL query to complete.

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2022-01-19

619 reads

SQLServerCentral Article

Playing popular game of Wordle using T-SQL

  • Article

Popular and addictive game of Wordle is now written in Transact SQL script. With this script, you can now  play this game on Microsoft SQL Server, using your favourite editor - SSMS, ADS, VS Code, and enjoy playing the game during free time, or whilst waiting for the other SQL query to complete.

You rated this post out of 5. Change rating

2022-01-19

4,412 reads

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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          2024-04-07
I 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.CustomerName

See possible answers