database-schema

We have an Oracle DBMS (11g) and the following configuration: A DB user "MYUSER" Two schemas "MYUSER" and "SCHEMA_B" User "MYUSER" can access "SCHEMA_B" and has READ permissions on its tables A public DB link "DB_LINK" located in "SCHEMA_B" The DB_LINK is working when using the DB user "SCHEMA_B" directly Question : When logged on as "MYUSER", what is the correct syntax to access tables using the DB link of "SCHEMA_B"? Is it possible to do so at all? I already tried several constellations, which all did not work: select * from dual@"DB_LINK" select * from dual@"SCHEMA_B"."DB_LINK" select *

[ UPDATED SCHEMA: http://i.imgur.com/fX9CGNh.png ] I'm tasked with developing an appointment booking system that is designed for a small medical office. It is a Rails 3.2 app. I'm having difficulty designing a database schema that makes sense to me. Question: Given the following information, what is the correct relationship between doctors, patients, appointments, chairs and time_slots? Patients need to make appointments with a doctor's office. Depending on the type of appointment, each appointment is scheduled for one or more adjacent time_slots, and whether or not there can be two

I am trying to design a database to store all my friends and my golf scores. As you probably know, a golf score is comprised of 18 hole individual scores. I can think of two ways to design the schema: Create a table that has one column for each hole (e.g. h1 to h18), the table has FK player_id, round_id and course_id that referenced other tables. It has a total column, which is the sum of columns h1 to h18. If I change a hole score, I will need to manually update total column. Create a table that has a column for hole score, a column for hole index, a column for player_id, course_id, and round

I'm using SQL Server 2008 and have the following query: SELECT SO1.name AS Tab, SC1.name AS Col, SO2.name AS RefTab, SC2.name AS RefCol, FO.name AS FKName FROM dbo.sysforeignkeys FK INNER JOIN dbo.syscolumns SC1 ON FK.fkeyid = SC1.id AND FK.fkey = SC1.colid INNER JOIN dbo.syscolumns SC2 ON FK.rkeyid = SC2.id AND FK.rkey = SC2.colid INNER JOIN dbo.sysobjects SO1 ON FK.fkeyid = SO1.id INNER JOIN dbo.sysobjects SO2 ON FK.rkeyid = SO2.id INNER JOIN dbo.sysobjects FO ON FK.constid = FO.id How do you retrieve the table's schema name? Thanks for your help gbn Use OBJECT_SCHEMA_NAME SELECT OBJECT

We have a site which has sub domains like: example.com - Main Site food.example.com fashion.example.com And each domain and sub domain has a different database, like this: exampleDB - Main DB with Users Table foodDB fashionDB What have you tried? Right now, for single sign in we have planned to redirect users in our Main Site for signing up. While order processing in sub domains get the UserID from main DB and store in respective sub domain's Orders table. For reporting purposes we store the UserID without FK constraint in the Orders table since we have separate database. I can see here that

I come from a MySQL background and am trying to wrap my head around MongoDB . In particular, I'm struggling to conceptualize how I should model n:n relationships the "Mongo way." For this example, let's say we have two collections : users and interests . We need to be able to represent or query for several things in our data: User's interests User's rating of interest, e.g. "like" or "dislike" Users with a given interest Counter (which can be incremented/decremented) of each rating of the interest Interest name In MySQL , I would have created a users_interests table indexed on both user IDs

I am working on an enterprise project. Some members of the team have an Oracle background and some have a Microsoft SQL Server background. There is much confusion when we talk about schemas. I am trying to provide some clarity. Is this an accurate way to describe the difference in the meaning of schemas between the two technologies? An Oracle schema is associated with a single user and consists of the objects owned by the user. A MS SQL Server schema is a namespace. Tarzan Oracle schemas are like My Documents folders in the Windows OS. A user can grant permissions to other users to see things