Stories of daily programming
In the previous post we saw how to merge two or more historical tables with a T-Sql script. We will now propose a different solution to the problem that also takes into account the presence of gaps in the validity periods of the records. We’ll start from the same test database we used for the…
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In this post we are going to explain how we can merge the content of two or more historical tables in a Sql Server database with some T-SQL queries. I’ll try to be more clear: Create a basic data structure Let’s start by creating some tables that we will fill with some fake data, just…
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In recent days I was working on one of my projects, in which it was necessary to install Sql Server 2019. I restored the database I was working on in this new Sql Server instance and I started using it. Calling one of the database’s stored procedure, which worked perfectly in the previous Sql Server…
Imagine waking up on a cold winter morning, and receiving an error from your customer that reads as follows: “Cannot construct data type date, some of the arguments have values which are not valid.” Apart from the error message and the web page in which it occurred, I didn’t have much other information. I don’t…
Good morning my friends! It’s been exactly a month since we last spoke! I’m very busy with a new project, which I hope to share with you soon. Apart from that, I want to share with you a link which I think will be useful: https://github.com/microsoft/sql-server-samples/tree/master/samples/databases/northwind-pubs What does it contain? From the link above you…
Today I will share with you some suggestions about using SARGable predicates. First of all let’s start explaining what is a SARGable predicate…SARGable stands for Search Argument able: in a nutshell a predicate is SARGable if Sql Server can use an index to improve the execution of the query. Use the following operators to build…
Sql Server Instant File Initialization is a Sql Server option that, I have to admit, I didn’t know. Activating this option you can slightly improve performances when Sql Server needs to grow data files and during backup and restore of a database. When Sql Server grows data files and transaction log files, it fills with…
Good morning guys! Today I want to talk about a Sql Server feature that you could use when creating foreign key constraints: the WITH NOCHECK option. If you look at the name it seems that with that option, the constraint is not enforced… but it is not true. You can check this by running this…
Hi guys!! Today I want to share a simple but useful trick to show the version of your SQL Server. Just type the following command: SELECT @@VERSION This is the result in my development machine: Microsoft SQL Server 2019 (RTM-GDR) (KB4517790) – 15.0.2070.41 (X64) Oct 28 2019 19:56:59 Copyright (C) 2019 Microsoft Corporation Developer Edition…
Today I want to talk about how to get all referencing tables of a Sql Server table. It is useful, for example, if you need to delete a certain record but you can’t because is referenced by many other tables. In short we will see how to accomplish that… First of all we need a…
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