What I need to do is set a constraint such that the WrenchingTool field can only contain ToolNumbers that have a corresponding ToolType of "Wrench." Meanwhile, the HammeringTool field has no such ...

When I am working with an Oracle database, I still find myself using SQL*Plus for many quick and dirty database queries. In particular, I often look up constraints in SQL*Plus. In this post, I ...

Integrity constraints are a set of data validation rules that you can specify to restrict the data values accepted into a SAS data file. Using integrity constraints can preserve the correctness and ...