database-design

来源： https://stackoverflow.com/questions/206970/best-way-to-store-multiple-flags-in-database

来源： https://stackoverflow.com/questions/27284910/create-big-integer-from-the-big-end-of-a-uuid-in-postgresql

问题 I am designing a notification service (server). I can have two kinds of notifications: one which is delivered immediately, and the other is delivered at some time in the future. Is there a framework to handle the future notifications? I know I can write background worker who can for example sample the DB to look for a notification which needs to be sent, but I sure millions tried to solve this problem already and I'd prefer to reuse a proven solution. I didn't decide yet on the framework / DB

问题 I got this below user interface for scheduling functionality. I need to setup the doctors available time for some days for each week of the month. How should i create the table for handling this. I thought i can create a table structure with the below columns DoctorId Date AvalableFrom AvalilableTo But here the problem is I will be adding 2 rows for the same doctor if he visit two different timings in same day. Is there any issue in my database schema or any better table design will help me

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

问题 This question already has answers here : Is storing a delimited list in a database column really that bad? (10 answers) Closed 2 days ago . I've got an assignment to run some SQL queries on a table looking like this: T1 C1| C2 | C3 x1| y1 | z1 x2| y2 | z2 But I'm not sure how to create the table in SQL. 回答1: Are you sure is the right way to design the tables? It look like a simple Master/Detail model Probably your T1 table is the master On the second table (C) put a column with reference ID

问题 Could someone help me with BrowseTo macro plsease? I cannot figure out one of the arguments in the this macro in ACCESS 2010 which is PathToSubformControl . I have this Form called "frm_navigation": The names of all Tab are: nav_vacancies, nav_contacts, nav_organizations etc. The field "Organization name" in the figure will hold the name from another table tbl_organizations. However, the Tab "Organizations" (the third from left) will display all info from the table tbl_organizations. I would

问题 Could someone help me with BrowseTo macro plsease? I cannot figure out one of the arguments in the this macro in ACCESS 2010 which is PathToSubformControl . I have this Form called "frm_navigation": The names of all Tab are: nav_vacancies, nav_contacts, nav_organizations etc. The field "Organization name" in the figure will hold the name from another table tbl_organizations. However, the Tab "Organizations" (the third from left) will display all info from the table tbl_organizations. I would

问题 Could someone help me with BrowseTo macro plsease? I cannot figure out one of the arguments in the this macro in ACCESS 2010 which is PathToSubformControl . I have this Form called "frm_navigation": The names of all Tab are: nav_vacancies, nav_contacts, nav_organizations etc. The field "Organization name" in the figure will hold the name from another table tbl_organizations. However, the Tab "Organizations" (the third from left) will display all info from the table tbl_organizations. I would