SQL COALESCE Function
The first time I saw the term COALESCE in a SQL manual, I thought it was a scientific function for some complex calculation. However, later I found that it is a straightforward and handy function. In this article, I will show several examples to explain how to use the COALESCE function.
THE REASON BEHIND COALESCE: THE NULL VALUE
Before go deep with COALESCE function, the reader needs to understand how the NULL value works in some expressions. A NULL value in a table column means ...
Cast vs. Convert
When working with Microsoft’s SQL Server (and by extension, T-SQL), you have two options when making explicit conversions: CAST and CONVERT.
Many people use them frequently, and quite often interchangeably, but there are some cases when one is a better choice than the other. This post covers the similarities and the differences between the two, as well as when you’re better off using one over the other.
When doing explicit data conversions, CAST and ...