I have two primary (composite) keys that refer to a shop and a branch. I thought I should have used a corresponding ID for each row, so I added a UNIQUE + AUTO_INCREMENT named ID.
Title is kinda confusing, sorry. I\'m collecting a bunch of data on my website that I will eventually be sending over to another website\'s API via cURL. I can make everything work on the technical s
I want users to be able to select their majors. For example, person A could select computer science, mathematics, and history as his majors. Users can select any number of majors.
First of all, I apologize for my potentially shallow understanding of NoSQL architecture (and databases in general) so try to bear with me.
A transaction should not be modified after it has been processed. A payer details can change over ti开发者_C百科me.
I\'m using Doctrine 2 for my ORM and for my app I have Users, who can h开发者_运维技巧ave a many to many relationship with Companies, but a user can only have one active/current company.My question is
I have millions of songs, each song has its unique Song ID. Corresponding to each Song ID I have some attributes like song name, artist name, album name, year etc.
I have a table that stores user info. In the User table, username开发者_开发技巧 is unique. Do you think I should make username as primarykey or should I use a surrogate key that is an int?
I have a very simple table called genre, which looks like this: GENRE ===== id int genre_category varchar()
For a large table of transactions (100 million rows, 20 GB) that already has a primary key (a natural composite key of 4 columns), will it help performance to add an identity column and make that the
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