functional-dependencies

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How to determine candidate keys from record schema and functional dependencies?

If I have a schema say R={A,B,C,D} and functional depen开发者_如何学Cdencies say {B->C, D->A} will my set of candidate keys be {B,D} or {BD}?If B were a candidate key, you\'d have to be able to[详细]

2023-04-08 22:37 分类：问答
F# application structure logging / repositories etc

I\'m gradually switching into F# for a lot of my home projects but I\'m a little stumped as to how to wire together complete applications, and more particularly cross-cutting concerns.[详细]

2023-04-06 05:01 分类：问答
Shortening code by exploiting symmetry among multiple type class instances

Context I\'m writing a Haskell module that represents SI prefixes: module Unit.SI.Prefix where Each SI prefix has a corresponding data type:[详细]

2023-03-31 05:14 分类：问答
Functional Dependency Reduction

I\'m supposed to find the minimal cover for this set of FD\'s. 开发者_运维问答Please let me know if my answer is correct.[详细]

2023-03-24 15:02 分类：问答
Determining the functional dependencies of a relationship and their normal forms

I\'m studying for a database test, and the study guide there are some (many) exercises of normalization of DB, and functional dependence, but the teacher did not make any similar exercise, so I would[详细]

2023-03-23 01:48 分类：问答
Difference between canonical cover and minimal cover

I know how to calculate a minimal cover-- ensure each functional dependency only has one attribute on the RHS,[详细]

2023-03-12 22:41 分类：问答
Normalization 3NF

I an reading through some examples of normalization, however I have come across one that I do not understand.[详细]

2023-03-10 00:39 分类：问答
Identifying Functional Dependencies II

Here is an example which should clear things up for the last post. hireDate & carReg are the primary keys. Are there extra functional dependencies (FDs) other than the ones I have identified[详细]

2023-02-28 09:48 分类：问答
Dependency Theory - Question

I have been trying for the past few hours to get this, 开发者_高级运维I have included below the only answer I have worked out that seems like it may go somewhere, can someone tell me if I am on the ri[详细]

2023-02-19 16:19 分类：问答
Functional dependencies and Normalization

consider a relation R = {P, Q, R, S, T} and the functional dependency F = {P -> Q, {Q, R} -> S, S -> {Q, R}, {S, T} -开发者_开发知识库> phi}. Are there any redundant functional dependencies in F? If s[详细]

2023-02-01 02:32 分类：问答