General Database Posts
If an ID or reference is used more than once in a process, it’s best to store it in a variable and reference that. This can slow down debugging, but makes a process far more portable. It also reduces the number of magic numbers in a process (or at least times they are defined). I…
Part of managing data is cleaning text. Tabs, spaces and line breaks can sneak in, and confuse output. When working with whitespace characters and line breaks, we can’t see them. This can cause a lot of confusion for users (and developers) when unexpected behavior occurs. Keep in mind we have to be careful, often we…
A new project, incomplete documentation, and the original author gone. I need to know “what updates and uses this object?”. So, how do I search for it?. If there is good source control and code management, a simple search will work. In many cases, there isn’t the luxury of code management. Search the code behind…
When are two values the same but different? When they are both NULL. Here I compare equality checks, including my datatype neutral method. The Problem Equality (or lack thereof) between values is an easy check. Is 1 = 3, or is 4 <> 5? Many people (and processes) get unexpected results when they try to…
Here is a quick look at number sequences, which are a brilliant (and fairly database neutral) method to create numbers (and rows) to build datasets from. While working on the dates articles, I used number sequences a lot and thought they were worth coming back to. What is a number sequence A number sequence can…
I’m not saying that floating point numbers are the devil, and I’m not saying that the float data type should be avoided. But they should only be used when it’s entirely necessary and appropriate. The hidden danger of improper use can can become a ticking time bomb! Most (if not all) dangers come from FLOATs…
Having spent a lot of time looking at dates in SQL Server, I thought I’d take some time to publish some notes on dates in Oracle. Most of the ideas are the same, but there are some subtleties. After my SQL Server articles: Dates In SQL Server: Managing & Manipulating Dates Dates In SQL Server:…
For most business reporting, public holidays (or other special days) cary much business impact. Here are some ideas on solutions. It usually doesn’t take long with a data warehouse project before we want to enhance our calendar. Holidays aren’t built into DBMS systems by default, so we have to create our own solution. I feel…
Finding the last X day of the month isn’t as easy as you might think. I learned this when people wanted to build a calendar for planning and automation. This is a neat addition to the article: Dates In SQL Server: Weekdays & Weekends Create sample date data From my previous article, the below SQL will…
When writing a date in a script, there are a number of ways of doing it, the server uses geographic settings to imply the format. This has some hidden dangers. UK and US dates switch the day and month around. If there are changes in geographic settings and the date format isn’t explicit, there can…