by Jeanne Combrinck | Jul 27, 2018 | SQL Girl
Over the years I have come across a lot of merge statements and I find most of the time there is one fundamental flaw in how it is written by most people. In the update section in most cases I find that there is no section there to check if anything has changed...
by Jeanne Combrinck | Jul 25, 2018 | SQL Girl
Following on from my previous post about modifying data in a temporal table, I will be looking into querying the data in this post. When you want to get latest (actual) state of data in a temporal table, you can query the same way as you query a normal table. If the...
by Jeanne Combrinck | Jul 23, 2018 | SQL Girl
Following on from my previous post about Temporal Tables, this post talks about modifying temporal tables. Data in a temporal table is modified using regular DML statements with one important difference: the period column data cannot be directly modified. When data is...
by Jeanne Combrinck | Jul 19, 2018 | SQL Girl
Let’s start off with what is a temporal table? SQL Server 2016 introduced support for system-versioned temporal tables as a database feature that brings built-in support for providing information about data stored in the table at any point in time rather than only the...
by Jeanne Combrinck | Jul 16, 2018 | SQL Girl
Lets start off with what is a table-valued function (TVF)? A TVF is a dynamic table produced at the time of execution, depending on parameters. Like a view, a TVF creates a result set only when it’s executed, but, unlike a view, it can be parameterized. You get two...
by Jeanne Combrinck | Jul 9, 2018 | SQL Girl
Indexing can be quite confusing at times if you not 100% sure on what to do. Do you just index on key or do you add included columns? Well this depends on what you are doing and what type of performance improvement you are looking for. Lets start with some history,...
