Starting SQL Server 2014, it is possible to use memory optimized table variables. These are table variables declared using a table type which is memory optimized. Memory optimized table...
2016-05-15
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SQL Server configuration parameter “optimized for ad hoc workloads” can be very useful when you execute lots of single use ad hoc statements or dynamic SQL statements by reducing...
2016-05-15
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In SQL Server, concurrent writes or read / write to the same page can lead to PAGELATCH (like PAGELATCH_EX and PAGELATCH_SH) waits or what is knowns as PAGELATCH contention....
2016-05-15
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In SQL Server, for insert into select statements, when the target for insert into is temporary table, the select statement can execute in parallel. When the target is table...
2016-05-15
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When SQL Server has a choice of plans, it will compare the cost among a set of execution plans and will choose the cheapest one. In some cases, even...
2016-05-15
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SQL Server caches temporary objects (temporary tables and table variables), that are created in a stored procedure. Temporary objects that are created either in dynamic SQL statement or by...
2016-05-15
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In SQL Server, the concurrent creation of temporary objects (temporary tables and table variables) from many sessions can lead to tempdb allocation contention. This contention occurs on PFS and...
2016-05-15
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In SQL Server, the concurrent creation of temporary tables from many sessions can lead to tempdb metadata contention. Tempdb metadata contention does not affect the concurrent creation of table...
2016-05-15
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In SQL Server, ASYNC_NETWORK_IO wait time can be high due to slow network, like when the database is in the cloud and the application is on premise. Furthermore, it...
2016-05-15
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Resource Governor in SQL Server provides CPU, Memory and I/O throttling. In SQL Server 2014 and earlier, CPU throttling works only for similar kind of workloads and not for...
2016-05-14
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How can you achieve good enough without compromising the process/product? In the world of...
By Patrick
One of my customers recently wanted to rename each of the SQL audit files...
The post The pros and cons of self-service BI: What every industry leader should...
Comments posted to this topic are about the item What's New for the Microsoft...
Comments posted to this topic are about the item 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