data-modeling

问题 I have financial data and my goal is to be able to forecast. I ran an arima model and found that the best fit was arima(1,1,1) w/ drift. I want to use GARCH on the data set because it is the better model to use due to volatility and when I squared my residuals it did have the arch effect. But I know that GARCH takes in a 2 parameter arima and I am not sure how that translates from the 3 parameter arima I currently have. library(dplyr) library(tidyr) library(lubridate) library(ggplot2) library

问题 If I have a relationship between two tables (both tables have their own primary keys) what should guide my decision as to which table should store the foreign key? I understand that the nature of the relationship probably matters (one-to-one, one-to-many, many-to-many, uni-directional, bi-directional), and probably access patterns matter too. What is a systematic way of making that decision though? 回答1: Which table is the child in the relationship? Answer that, and you know which table needs

来源： https://stackoverflow.com/questions/54041802/efcore-how-to-exclude-owned-objects-from-automatic-loading

来源： https://stackoverflow.com/questions/4169893/is-it-good-database-design-to-have-admin-users-in-the-same-table-as-front-end-us

来源： https://stackoverflow.com/questions/4169893/is-it-good-database-design-to-have-admin-users-in-the-same-table-as-front-end-us

来源： https://stackoverflow.com/questions/4169893/is-it-good-database-design-to-have-admin-users-in-the-same-table-as-front-end-us

来源： https://stackoverflow.com/questions/4169893/is-it-good-database-design-to-have-admin-users-in-the-same-table-as-front-end-us

来源： https://stackoverflow.com/questions/63904198/how-to-take-values-in-one-column-and-have-those-values-be-additional-columns-ins

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Improve this question I know that most of the time NOSQL databses are schema-less or at least have a flexible database schema. However, the basic schema needs to be modeled beforehand and may evolve later. So,in this case, is there a modeling tool/language for NOSQL databases? Like UML

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Improve this question I know that most of the time NOSQL databses are schema-less or at least have a flexible database schema. However, the basic schema needs to be modeled beforehand and may evolve later. So,in this case, is there a modeling tool/language for NOSQL databases? Like UML