database-schema

问题 I'm working on a multi tenant app using django-tenant-schema(and postgresql). Now as soon as the new schema is getting created, I'm using the call_command to create a superuser. I also thought of the option of using signal post_migrate. My doubt is how can I auto create a superuser without typing the password in shell. The use case is as soon as the user registers for his/her schema, a superuser is generated and the user logs in with the superuser username and password and can change the

问题 I'm trying to create a function to return all of the view names from a generic DbConnection. I'd like it to work for as many Database types as possible, but if I exclude some esoteric DB types, I don't mind. In my current code, I have some special logic for Oracle, but I can't shake the feeling that my code doesn't handle things in a very robust manner: Collection<string> Views { get { using (var dtViews = dbConnection.GetSchema("Views")) // Determine the proper method to retrieve all tables

问题 I need to know all the tables on which particular user let's say 'Abc' has any(read, write) kind of access. Is this possible in db2? 回答1: Try the SYSIBMADM.PRIVILEGES administrative view. You can find more about it in the DB2 Knowledge Center: SELECT AUTHID, PRIVILEGE, OBJECTNAME, OBJECTSCHEMA FROM SYSIBMADM.PRIVILEGES WHERE OBJECTTYPE='TABLE' AND AUTHID='userID' 回答2: Please use below to get list of of users, corresponding table and type of access(delete, modify, update, select etc), SELECT

问题 My problem relates to DB schema developing and is as follows. I am developing a purchasing module, in which I want to use for purchasing items and SERVICES. Following is my EER diagram, (note that service has very few specialized attributes – max 2) My problem is to keep products and services in two tables or just in one table? One table option – Reduces complexity as I will only need to specify item id which refers to item table which will have an “item_type” field to identify whether it’s a

问题 I am working on a health app and I'm designing a database (MySQL), which should store symptoms and diseases and bodyparts. The app will work as follows: User chooses gender, age and bodypart (front/back) App shows all (common/less common) symptoms of chosen bodypart User chooses symptom App shows all (common/less common) diseases of chosen symptom. User chooses disease App shows disease information I got some help so far, but I still need some help finding a solution: Making weight in symptom

问题 Given relation R(A,B,C,D,E) and FDs = {A->BC, CD->E, B->D, E->A} While converting R into BCNF: ABCDE -> BD & ABCE will be first decomposition BD is in BCNF Regarding ABCE: Opinion 1: ABCE has FDs: A->BCE, E->ABC, BC->AE Therefore its already in BCNF Opinion 2 ABCE has FDs: A->BC, E->ABC Therefore needs to be decomposed into ABC & AE I believe that first one should be correct because in second we are assuming that A->E and BC->E are not possible because D is not one of the attributes of the

问题 I need to create a database system wherein normal users can create questions with, only 2, belonging answers and these questions can then get a up- or down-vote by people visiting the site. I am wondering in which way it would be best to create this database, specifically the tables required and their relations. Within this site, there will be, at least, two user groups . Normal users and institution users . Institution users should be able to create a profile for their institution , normal

问题 The work flow for something is as follows 1) Create a "Message of the Day" for a particular group of users (which must be approved before active) 2) Assign who can approve this by selecting single users, and/or users who are admins of the group this MOTD is going into, or any other number of groupings for users. 3) "Message of the Day" must no be approved by one of the 'approvers' selected. How can I relate a MOTD record, to one or more of "single users" and/or "groupings of users" 回答1: One

问题 Is it possible to issue something like RENAME COLUMN col1 col2 in Google Cloud Spanner? It looks from the DDL that this isn't possible; if not, is this a design choice or a limitation whilst in Beta? 回答1: No, this is not possible. Currently you can only do the following with regard to altering columns in a table: Add a new one Delete an existing one, unless it's a key column Change delete behavior (cascading or not) Convert between STRING and BYTES Change length of STRING and BYTES Add or

问题 First, thanks for taking the time to read this. I'm having some difficulties with trying to update a database using EF. I've used this same approach before on another project, so I'm thinking the issue is perhaps in the database, but I'm just not seeing it. The database is a legacy db in SQL 2005, and the naming convention has a lot to be desired, therefore I've been mapping the inconsistent names to something more consistent via the HasColumnName method: as in. modelBuilder.Entity<Case