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What are the differences in database terminology between MS SQL and MySQL?
Can a MySQL instance have more than one database? It appears that it can only create different schemas. However, the SQL command is create database.
In MS SQL, you can create multiple databases… each have a default schema of dbo?… but multiple schemas in a database is still possible?
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Logical structure can be used by the schema to store data while memory component can be used by the database to store data. Also, a schema is collection of tables while a database is a collection of schema. In the oracle database, the schema can be used to represent a part of the database.
In Oracle, a database consists of physical files that contain data and metadata. These include the datafiles, controlfiles, and redo log files. Unlike SQL Server and PostgreSQL, there is no separate schema object. However, if a user becomes an owner of any objects like tables, views, etc., it is treated as a schema.
The database schema is divided into three types, which are: Logical Schema. Physical Schema. View Schema.
1. A database in PostgreSQL contains the subset of schema. It contains all the schemas, records, and constraints for tables. A Schema in PostgreSQL is basically a namespace that contains all the named database objects like tables, indexes, data types, functions, stored procedures, etc.
From this link, we see that MS SQL schemas are no longer tied to users, here's the relevant quote:
The behavior of schemas changed in SQL Server 2005. Schemas are no longer equivalent to database users; each schema is now a distinct namespace that exists independently of the database user who created it. In other words, a schema is simply a container of objects. A schema can be owned by any user, and its ownership is transferable.
In MySQL, databases and schemas are exactly the same thing, you can even interchange the word in the commands, i.e. CREATE DATABASE has the synonym CREATE SCHEMA.
MySQL supports multiple databases (schemas) and MS SQL supports multiple databases and multiple schemas.
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