Difference Between Schema Database in MySQL

Question

Is there a difference between a schema and a database in MySQL   In SQL Server  a database is a higher level container in relation to a schema   I read that Create Schema and Create Database do essentially the same thing in MySQL  which leads me to believe that schemas and databases are different words for the same objects

User · Answer

in MySQL schema is synonym of database   Its quite confusing for beginner people who jump to MySQL and very first day find the word schema  so guys nothing to worry as both are same   When you are starting MySQL for the first time you need to create a database  like any other database system  to work with so you can CREATE SCHEMA which is nothing but CREATE DATABASE  In some other database system schema represents a part of database or a collection of Tables  and collection of schema is a database

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Yes  people use these terms interchangeably with regard to MySQL   Though oftentimes you will hear people inappropriately refer to the entire database server as the database

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Refering to MySql documentation      CREATE DATABASE creates a database with the given name  To use this   statement  you need the CREATE privilege for the database  CREATE   SCHEMA is a synonym for CREATE DATABASE as of MySQL 5 0 2

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As defined in the MySQL Glossary      In MySQL  physically  a schema is synonymous with a database  You can substitute the keyword SCHEMA instead of DATABASE in MySQL SQL syntax  for example using CREATE SCHEMA instead of CREATE DATABASE       Some other database products draw a distinction  For example  in the Oracle Database product  a schema represents only a part of a database  the tables and other objects owned by a single user

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PostgreSQL supports schemas  which is a subset of a database  https   www postgresql org docs current static ddl-schemas html     A database contains one or more named schemas  which in turn contain   tables  Schemas also contain other kinds of named objects  including   data types  functions  and operators  The same object name can be used   in different schemas without conflict  for example  both schema1 and   myschema can contain tables named mytable  Unlike databases  schemas   are not rigidly separated  a user can access objects in any of the   schemas in the database they are connected to  if they have privileges   to do so    Schemas are analogous to directories at the operating system level  except that schemas cannot be nested   In my humble opinion  MySQL is not a reference database  You should never quote MySQL for an explanation  MySQL implements non-standard SQL and sometimes claims features that it does not support  For example  in MySQL  CREATE schema will only create a DATABASE  It is truely misleading users   This kind of vocabulary is called  MySQLism  by DBAs

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Microsoft SQL Server for instance  Schemas refer to a single user and is another level of a container in the order of indicating the server  database  schema  tables  and objects   For example  when you are intending to update dbo table a and the syntax isn t full qualified such as  UPDATE table a the DBMS can t decide to use the intended table  Essentially by default the DBMS will utilize myuser table a

User · Answer

Depends on the database server  MySQL doesn t care  its basically the same thing   Oracle  DB2  and other enterprise level database solutions make a distinction  Usually a schema is a collection of tables and a Database is a collection of schemas

[mysql] Difference Between Schema / Database in MySQL

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