What does value propagation mean?
I am working on an algorithm which calculates intervals for variables in some given constraints. For example there is a function called propagateValues and its description is
Representing a rule in a ruleset
How to represent rules for a rule engine as objects?
Should I check integrity in my application code or defer to the database? [duplicate]
This question already has answers here: Should my multi-server RDBMS or my Application handle database Referential Integrity? (5 answers) Closed 11 years ago. At work we have a lot of code like this (pseudocode): response form_submit(string username, string password) { if ( username == “” || username.contains(invalid_chars) || password.length < 5 || … ) { […]
Is there a name for this kind of database constraint? “Functional foreign key”? And is it a good idea?
Say we want to enforce that a table represents a tree. I have found this method for doing so:
What kind of algorithm could be used to produce an ordering which maximizes # of satisfied ‘less than’ constraints?
Let’s say I have a set of items {e1, e2, …, en}, and I also have a set of constraints {c1, c2, …, cm}, with ci := ej appears before ek, for some j and k.
Environment that enables variable constraint checking and creation
Currently, I’m working on a system that enables users to add Tag’s to available TagTypes on specific pages. For instance, we would have a TagType called “Installer” and the user wants his name associated with it (his name then would be the Tag).
Environment that enables variable constraint checking and creation
Currently, I’m working on a system that enables users to add Tag’s to available TagTypes on specific pages. For instance, we would have a TagType called “Installer” and the user wants his name associated with it (his name then would be the Tag).
Environment that enables variable constraint checking and creation
Currently, I’m working on a system that enables users to add Tag’s to available TagTypes on specific pages. For instance, we would have a TagType called “Installer” and the user wants his name associated with it (his name then would be the Tag).
Environment that enables variable constraint checking and creation
Currently, I’m working on a system that enables users to add Tag’s to available TagTypes on specific pages. For instance, we would have a TagType called “Installer” and the user wants his name associated with it (his name then would be the Tag).
Fixing bad data in a database – redo or incremental
I have pseudo-ownership of a fairly old db (original data from 30 years ago; current design is >15 years old). In my opinion, the schema is pretty broken, and one of the implications of this is that there are a lot of inconsistencies/issues with the data. I’m planning to write a new schema and port the data across, which is a fairly simple task as new data comes in rarely.