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Tag Archive: SQL Server

  • @@ROWCOUNT in Synapse Dedicated SQL Pool

    June 6th, 2023 in Blog, SQL Server, Synapse

    If you’ve been working with dedicated SQL pools in Synapse, you may have noticed that the SQL Server system variable @@RowCount is not supported. I will show you a workaround in synapse to get the same information. First, use the query label option to give your query an identifier that you can use to track it: SELECT * FROM Dim.Date OPTION (LABEL = ‘MyQuery’) You can then use DMVs to find your query using the specified label…

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  • Why Are There Gaps in the Identity Column in My SQL Database?

    May 17th, 2023 in Blog

    All too often there are questions asked about missing records that are identified by gaps in the identity column of a table. If a table, ordered by the identity column, shows “1, 2, 3, 5”, record 4 must have been deleted right? Well, although that is a possibility, it’s not a safe assumption as there are other causes of these “missing” IDs. Let’s start with a simple table, it only has 3 columns, the first of which being an…

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  • #This vs @That – Should I use a Table Variable or a Temporary Table?

    April 17th, 2023 in Blog, SQL Server

    When working with SQL Server, it’s not uncommon to need to store data in a temporary table or table variable. While both options can be used to accomplish the same goal, there are differences between the two that can affect performance and the ability to write efficient code. Let’s explore the differences between table variables and temporary tables, and when to use each one. @Table Variables Table variables are declared using the…

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  • Query Store Forced Plan Failures

    July 28th, 2022 in Azure, Blog, SQL Server, Uncategorized

    Query Store is a fantastic feature of both SQL Server and Azure SQL DB. It allows you to monitor how queries execute against the database which is invaluable for troubleshooting performance issues. More than that though, it gives you the option to force an erratic query to use a particular execution plan, this helps avoid queries from running with inefficient plans and provides predictability and stability on the server. Here we can see an…

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  • The SQL Query Alias Conundrum – Order of Execution

    May 17th, 2022 in Blog, SQL Server, Uncategorized

    So, you have just written a query, hit execute and you have encountered an error: Invalid column name ‘[column name]‘. The column you’ve used in your WHERE clause cannot be identified by its alias. You’ve defined it at the top of the query and used it fine previously as your ORDER BY condition, so why can’t the engine recognise it? If you’ve ever written a SQL query, this should look familiar: SELECT DISTINCT FROM JOIN ON…

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  • Automate changing SSIS connection at runtime

    October 15th, 2021 in Blog, Integration Services, SQL Server, SSIS, Uncategorized

    Recently a customer came to us with an issue: “We have a primary/secondary AlwaysOn failover cluster, we want the data warehouse ETL to always pull from the secondary read-only replica. When the primary fails over, how can we detect this and repoint the ETL to the new secondary?” This led us to the following qualification steps:1. Is the secondary server accessible? a. Yes – Use it. b. No – Try the primary server.2. Is…

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  • SQL LAST_VALUE() wrong results

    March 2nd, 2020 in Blog, SQL Server

    You may have come across the following scenario when using the LAST_VALUE() function. You want to find the first or last value loaded in a result set, therefore you use the FIRST_VALUE() and LAST_VALUE() functions like below: You expect to get “A” for every record in the FirstValue column and “E” for every record in the LastValue column.However you see the following output: LAST_VALUE() on its own is implemented from the…

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  • SQL Server 2016 Licensing Changes, SP1, v.Next CTP1, etc.

    November 16th, 2016 in Blog, SQL Server

    By now you’ve probably heard the exciting news announced at today’s Microsoft Connect conference; SQL Server licensing is changing, significantly, from SQL 2016 SP1. The functionality of SQL Server Standard, Web & Express editions are being brought up to [almost, 99%] match that of Enterprise Edition. This has a number of critical impacts: Developers can write applications using a single set of SQL Server functionality, and can…

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  • SQL Battleships

    June 2nd, 2016 in Blog, Community, Just For Fun, SQL Server

    When Battleships Met SQL Server, like Bailys meeting Coffee, but better. Do you have an equal love of the classic two player board game Battleship and also SQL Server database development? If the answer is yes (which it obviously should be) then this is the blog post for you! The next question that I’m more than happy to answer for you is; how can I combine these 2x loves?… Well my friend, please continue reading to find out. So, let’s…

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  • SQL Server Management Studio Code Snippets

    May 25th, 2016 in Blog, SQL Server

    Code Snippets are not a new thing. Many languages have them and many plugins for SQL Server Management Studio (SSMS) include them. However I believe the out of the box offering in SSMS is just fine and this post explores how I use the feature and how you could too. Code Snippet Types Firstly it is important to understand that within SSMS you have two different types of code snippet. These are: Expansion – offering the insertion of a…

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