database-normalization

来源： https://stackoverflow.com/questions/10113782/what-is-the-2nd-normal-form

来源： https://stackoverflow.com/questions/23681453/finding-a-relation-in-3nf-but-not-in-bcnf

来源： https://stackoverflow.com/questions/55797016/is-there-any-automatic-way-to-normalise-google-sheet-data

问题 Thank you for your knowledge in advance. I am studying for the Microsoft Technology Exam and one of the practice questions is : Creating a primary key satisfies the first normal form. True or False? I personally think it is False because the first normal form is to get rid of duplicate groups. But there is a sentence in the text (Database Fundamentals, Exam 98-364 by Microsoft Press) that says the following: "The first normalized form (1NF) means the data is in an entity format, which

问题 Address ( addressID , houseNumber, postcode, roadName, city, county) Reservation ( reservationID , roomNo, leadGuestID, guest2ID, guest3ID , arrivalDate, departureDate, addressID , amountOutstanding) Guest ( guestID , firstName, lastName, adultFlag, telephoneNo, addressID , emailAddress) Room ( roomNo , roomTypeName ) RoomType ( roomTypeName , floor, basePrice, extraAdultPrice, extraChildPrice) The above schema is supposed to be normalised 4NF. But I cannot see how leadGuestID, guest2ID &

问题 Please consider the following scenario. We have a 0NF table StudentTeacherTable: StudentName StudentDepartment StudentDepartmentAdd TeacherName TeacherDepartment TeacherDepartmentAdd John CS London Dave Eng, CS Oxford Mike CS London Dave Eng, CS Oxford Chris Eng Oxford Dave Eng, CS Oxford Ideally after normalization I would like to have tables like Student Table: StudentName Department TeacherName John CS Dave Mike CS Dave Chris Eng Dave Teacher Table: Name Dave TeacherDepartment Table:

问题 Please consider the following scenario. We have a 0NF table StudentTeacherTable: StudentName StudentDepartment StudentDepartmentAdd TeacherName TeacherDepartment TeacherDepartmentAdd John CS London Dave Eng, CS Oxford Mike CS London Dave Eng, CS Oxford Chris Eng Oxford Dave Eng, CS Oxford Ideally after normalization I would like to have tables like Student Table: StudentName Department TeacherName John CS Dave Mike CS Dave Chris Eng Dave Teacher Table: Name Dave TeacherDepartment Table:

问题 What are the best practices for database design and normalization for high traffic websites like stackoverflow? Should one use a normalized database for record keeping or a normalized technique or a combination of both? Is it sensible to design a normalized database as the main database for record keeping to reduce redundancy and at the same time maintain another denormalized form of the database for fast searching? or Should the main database be denormalized but with normalized views at the

问题 I have implemented RBAC (Role Based Access Control) tables. I have a requirement to add extra attribute on some roles, like 2nd_pwd attribute in Admin role, address attribute in Customer role. I have done this design, but it violates data integrity. When you removed (let's say) Admin role, you also need to remove admin data from Admin table. So I decided to add trigger for this job. Question: Is there a design for this requirement without trigger but still doesn't violate data integrity? What

问题 I'm working on setting up a database to house properties related to a game, for example whether or not it supports multiplayer, what genres it is, release dates, etc. It seems like creating two additional tables (genres, genres_data for example) for each category type isn't nearly as dynamic as it could be. My initial thought was to set it up one of two ways... Have a games table with skeletal information, then a properties table to list all the properties, and a third table to contain all