There are two categories of integrity constraints: General constraints, which allow you to restrict the data values that are accepted for the variables in a single data file, such as requiring that ...

I'm trying to update multiple records using a non-primary key. However, it only updates the first row it finds and not all rows.<BR>Is this possible or do updates require a primary key (and therefore) ...

Say we have two types of tools: hammers and wrenches. We have a list of work orders, and we want to track what tool was used for the hammering and what was used for the wrenching. The problem is that ...