2014年6月12日 · In Oracle, datafile are system files where actual data is stored. The collection of datafiles make tablespace and, at last, database is collection of tablespaces. Correct me if I am wrong on the concepts of datafile, tablespace and database. I would like to understand the difference between Schema and Database in details.

2020年10月14日 · When I search the web for "ER diagram" and "database schema", these 3 diagram types are found, but all of them are referred to as "ER diagrams". I want to know: What is a database schema diagram and what is an ER diagram? Why all are named "ER diagram"?

2016年11月1日 · I'm designing a schema to support logging of user activity, where users must be able to search: Across all events (events of any type), with datetime range, by username; Across events of one type,...

2011年3月14日 · I have a database model with a user table and role table. I want to control the access (rights) to up to 10 different elements. The access can be granted to either a role or a single user. Below is...

2016年1月6日 · I'm very green when it comes to the world of database permissions management in SQL Sever. Let's keep an example simple. Say account 'admin' is the owner of schemas A, B, and C. There another ac...

2012年8月7日 · I am trying to create a database to store information about a school. I need to store each department in the school. Each department then has a list of teachers. Each teacher has a list of classes...

2011年2月17日 · Please note the following commands: \list or \l: list all databases \c <db name>: connect to a certain database \dt: list all tables in the current database using your search_path \dt *.: list all tables in the current database regardless your search_path You will never see tables in other databases, these tables aren't visible.

2013年4月15日 · When using PostgreSQL v9.1, how do I list all of the schemas using SQL? I was expecting something along the lines of: SELECT something FROM pg_blah;

2015年9月9日 · I need to setup a history feature on a project to keep track of prior changes. Let's say I have two tables right now: NOTES TABLE (id, userid, submissionid, message) SUBMISSIONS TABLE (id, name,

In practice, what I have found is that outputting a text file of the database schema is useful, when done as part of the build. This way, you can check the text file into your source code control system, and have a version history of how your schema has evolved over time. SchemaCrawler is designed to automate this too, from the command-line.