Historically the use of User Defined Functions aka UDF has represented a great option to encapsulate logic into Database reusable objects, nonetheless, during the implementation of scalar UDF (a variation based on the function’s output) for MS SQL Server we have been suffering painful performance penalties until the arrival of version 2019, so in this…
This is the second article of a series dedicated to implementing Recursive Common Table Expression in different kind of scenarios, and this time I will address another use case; it basically consists in filling gaps inside a sequence of an incomplete range of dates. I would like to comment that the next example has been…
I remember the first time that I discovered the amazing feature called Common Table Expression (CTE), it was during my first read of Itzik Ben-Gan book (T-SQL Querying), maybe one of the most interesting feature together with Windows Functions. I know, I am a declared fan of CTE, but we can start defining a CTE as…
I have to confess; I have had traumatic experiences with variant data type in my beginning as a software developer, in fact, I always have believed that it is an anti-pattern, at least in the OOP world, on the other hand in the Database world it gains much relevance, Why? Because of every column inside…