I'm new for this tool. When I tried to generate some data, I found one problem. After simply search in this forums and documents, it looks like no available information for my question. So post this topic. If you have the solution, that will be very helpful.
In my table there are 2 columns: A and B.
A can be set 1, 2, 3.
B can be any data when A is 1, 2 and only can be NULL when A is 3.
How can I set B column's generate rule?