What is the difference between a schema and a table and a database

Question

This is probably a n00blike  or worse  question  But I ve always viewed a schema as a table definition in a database  This is wrong or not entirely correct  I don t remember much from my database courses

User · Answer

Schema behaves seem like a parent object as seen in OOP world. so it's not a database itself. maybe this link is useful.

But, In MySQL, the two are equivalent. The keyword DATABASE or DATABASES can be replaced with SCHEMA or SCHEMAS wherever it appears. Examples:

CREATE DATABASE <=> CREATE SCHEMA
SHOW DATABASES <=> SHOW SCHEMAS

Documentation of MySQL

SCHEMA & DATABASE terms are something DBMS dependent.

A Table is a set of data elements (values) that is organized using a model of vertical columns (which are identified by their name) and horizontal rows. A database contains one or more(usually) Tables . And you store your data in these tables. The tables may be related with one another(See here).

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This particular posting has been shown to relate to Oracle only and the definition of Schema changes when in the context of another DB   Probably the kinda thing to just google up but FYI terms do seem to vary in their definitions which is the most annoying thing     In Oracle a database is a database  In your head think of this as the data files and the redo logs and the actual physical presence on the disk of the database itself  i e  not the instance   A Schema is effectively a user  More specifically it s a set of tables procs indexes etc owned by a user   Another user has a different schema  tables he she owns  however user can also see any schemas they have select priviliedges on  So a database can consist of hundreds of schemas  and each schema hundreds of tables   You can have tables with the same name in different schemas  which are in the same database   A Table is a table  a set of rows and columns containing data and is contained in schemas   Definitions may be different in SQL Server for instance  I m not aware of this

User · Answer

This particular posting has been shown to relate to Oracle only and the definition of Schema changes when in the context of another DB   Probably the kinda thing to just google up but FYI terms do seem to vary in their definitions which is the most annoying thing     In Oracle a database is a database  In your head think of this as the data files and the redo logs and the actual physical presence on the disk of the database itself  i e  not the instance   A Schema is effectively a user  More specifically it s a set of tables procs indexes etc owned by a user   Another user has a different schema  tables he she owns  however user can also see any schemas they have select priviliedges on  So a database can consist of hundreds of schemas  and each schema hundreds of tables   You can have tables with the same name in different schemas  which are in the same database   A Table is a table  a set of rows and columns containing data and is contained in schemas   Definitions may be different in SQL Server for instance  I m not aware of this

User · Answer

This particular posting has been shown to relate to Oracle only and the definition of Schema changes when in the context of another DB   Probably the kinda thing to just google up but FYI terms do seem to vary in their definitions which is the most annoying thing     In Oracle a database is a database  In your head think of this as the data files and the redo logs and the actual physical presence on the disk of the database itself  i e  not the instance   A Schema is effectively a user  More specifically it s a set of tables procs indexes etc owned by a user   Another user has a different schema  tables he she owns  however user can also see any schemas they have select priviliedges on  So a database can consist of hundreds of schemas  and each schema hundreds of tables   You can have tables with the same name in different schemas  which are in the same database   A Table is a table  a set of rows and columns containing data and is contained in schemas   Definitions may be different in SQL Server for instance  I m not aware of this

User · Answer

A database schema is a way to logically group objects such as tables  views  stored procedures etc  Think of a schema as a container of objects  And tables are collections of rows and columns  combination of all tables makes a db

User · Answer

A Schema is a collection of database objects which includes logical structures too  It has the name of the user who owns it  A database can have any number of Schema s  One table from a database can appear in two different schemas of same name  A user can view any schema for which they have been assigned select privilege

User · Answer

In a nutshell  a schema is the definition for the entire database  so it includes tables  views  stored procedures  indexes  primary and foreign keys  etc

User · Answer

A relation schema is the logical definition of a table - it defines what the name of the table is  and what the name and type of each column is  It s like a plan or a blueprint  A database schema is the collection of relation schemas for a whole database   A table is a structure with a bunch of rows  aka  tuples    each of which has the attributes defined by the schema  Tables might also have indexes on them to aid in looking up values on certain columns   A database is  formally  any collection of data  In this context  the database would be a collection of tables  A DBMS  Database Management System  is the software  like MySQL  SQL Server  Oracle  etc  that manages and runs a database

User · Answer

schema   database   table    floor plan   house   room

User · Answer

A Schema is a collection of database objects which includes logical structures too  It has the name of the user who owns it  A database can have any number of Schema s  One table from a database can appear in two different schemas of same name  A user can view any schema for which they have been assigned select privilege

User · Answer

In a nutshell  a schema is the definition for the entire database  so it includes tables  views  stored procedures  indexes  primary and foreign keys  etc

User · Answer

A relation schema is the logical definition of a table - it defines what the name of the table is  and what the name and type of each column is  It s like a plan or a blueprint  A database schema is the collection of relation schemas for a whole database   A table is a structure with a bunch of rows  aka  tuples    each of which has the attributes defined by the schema  Tables might also have indexes on them to aid in looking up values on certain columns   A database is  formally  any collection of data  In this context  the database would be a collection of tables  A DBMS  Database Management System  is the software  like MySQL  SQL Server  Oracle  etc  that manages and runs a database

User · Answer

In a nutshell  a schema is the definition for the entire database  so it includes tables  views  stored procedures  indexes  primary and foreign keys  etc

User · Answer

Schemas contains Databases   Databases are part of a Schema   So  schemas   databases   Schemas contains views  stored procedure s   database s   trigger s  etc

User · Answer

schema   database   table    floor plan   house   room

User · Answer

In oracle Schema is one user under one database For example scott is one schema in database orcl        In one database we may have many schema s like scott

User · Answer

A relation schema is the logical definition of a table - it defines what the name of the table is  and what the name and type of each column is  It s like a plan or a blueprint  A database schema is the collection of relation schemas for a whole database   A table is a structure with a bunch of rows  aka  tuples    each of which has the attributes defined by the schema  Tables might also have indexes on them to aid in looking up values on certain columns   A database is  formally  any collection of data  In this context  the database would be a collection of tables  A DBMS  Database Management System  is the software  like MySQL  SQL Server  Oracle  etc  that manages and runs a database

User · Answer

As MusiGenesis put so nicely  in most databases      schema   database   table    floor plan   house   room   But  in Oracle it may be easier to think of   schema   database   table    owner   house   room

User · Answer

In a nutshell  a schema is the definition for the entire database  so it includes tables  views  stored procedures  indexes  primary and foreign keys  etc

User · Answer

More on schemas   In SQL 2005 a schema is a way to group objects   It is a container you can put objects into   People can own this object   You can grant rights on the schema     In 2000 a schema was equivalent to a user   Now it has broken free and is quite useful  You could throw all your user procs in a certain schema and your admin procs in another   Grant EXECUTE to the appropriate user role and you re through with granting EXECUTE on specific procedures   Nice    The dot notation would go like this   Server Database Schema Object  or  myserver01 Adventureworks Accounting Beans

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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 he is connected to  if he has privileges to do so   There are several reasons why one might want to use schemas   To allow many users to use one database without interfering with each other   To organize database objects into logical groups to make them more manageable   Third-party applications can be put into separate schemas so they do not collide with the names of other objects   Schemas are analogous to directories at the operating system level  except that schemas cannot be nested   Official documentation can be referred https   www postgresql org docs 9 1 ddl-schemas html

User · Answer

More on schemas   In SQL 2005 a schema is a way to group objects   It is a container you can put objects into   People can own this object   You can grant rights on the schema     In 2000 a schema was equivalent to a user   Now it has broken free and is quite useful  You could throw all your user procs in a certain schema and your admin procs in another   Grant EXECUTE to the appropriate user role and you re through with granting EXECUTE on specific procedures   Nice    The dot notation would go like this   Server Database Schema Object  or  myserver01 Adventureworks Accounting Beans

User · Answer

A database schema is a way to logically group objects such as tables  views  stored procedures etc  Think of a schema as a container of objects  And tables are collections of rows and columns  combination of all tables makes a db

User · Answer

A schema is not a plan for the entire database  It is a plan container for a subset of objects  ex tables  inside a a database    This goes to say that you can have multiple objects ex  tables  inside one database which don t neccessarily fall under the same functional category  So you can group them under various schemas and give them different user access permissions    That said  I am unsure whether you can have one table under multiple schemas  The Management Studio UI gives a dropdown to assign a schema to a table  and hence making it possible to choose only one schema  I guess if you do it with TSQL  it might create 2  or multiple  different objects with different object Ids

User · Answer

Contrary to some of the above answers  here is my understanding based on experience with each of them    MySQL  database schema    table SQL Server  database     schema namespace     table Oracle  database schema user     tablespace     table   Please correct me on whether tablespace is optional or not with Oracle  it s been a long time since I remember using them

User · Answer

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 he is connected to  if he has privileges to do so   There are several reasons why one might want to use schemas   To allow many users to use one database without interfering with each other   To organize database objects into logical groups to make them more manageable   Third-party applications can be put into separate schemas so they do not collide with the names of other objects   Schemas are analogous to directories at the operating system level  except that schemas cannot be nested   Official documentation can be referred https   www postgresql org docs 9 1 ddl-schemas html

User · Answer

Contrary to some of the above answers  here is my understanding based on experience with each of them    MySQL  database schema    table SQL Server  database     schema namespace     table Oracle  database schema user     tablespace     table   Please correct me on whether tablespace is optional or not with Oracle  it s been a long time since I remember using them

User · Answer

schema   database   table    floor plan   house   room

User · Answer

schema   database   table    floor plan   house   room

User · Answer

This particular posting has been shown to relate to Oracle only and the definition of Schema changes when in the context of another DB   Probably the kinda thing to just google up but FYI terms do seem to vary in their definitions which is the most annoying thing     In Oracle a database is a database  In your head think of this as the data files and the redo logs and the actual physical presence on the disk of the database itself  i e  not the instance   A Schema is effectively a user  More specifically it s a set of tables procs indexes etc owned by a user   Another user has a different schema  tables he she owns  however user can also see any schemas they have select priviliedges on  So a database can consist of hundreds of schemas  and each schema hundreds of tables   You can have tables with the same name in different schemas  which are in the same database   A Table is a table  a set of rows and columns containing data and is contained in schemas   Definitions may be different in SQL Server for instance  I m not aware of this

User · Answer

A relation schema is the logical definition of a table - it defines what the name of the table is  and what the name and type of each column is  It s like a plan or a blueprint  A database schema is the collection of relation schemas for a whole database   A table is a structure with a bunch of rows  aka  tuples    each of which has the attributes defined by the schema  Tables might also have indexes on them to aid in looking up values on certain columns   A database is  formally  any collection of data  In this context  the database would be a collection of tables  A DBMS  Database Management System  is the software  like MySQL  SQL Server  Oracle  etc  that manages and runs a database

User · Answer

More on schemas   In SQL 2005 a schema is a way to group objects   It is a container you can put objects into   People can own this object   You can grant rights on the schema     In 2000 a schema was equivalent to a user   Now it has broken free and is quite useful  You could throw all your user procs in a certain schema and your admin procs in another   Grant EXECUTE to the appropriate user role and you re through with granting EXECUTE on specific procedures   Nice    The dot notation would go like this   Server Database Schema Object  or  myserver01 Adventureworks Accounting Beans

User · Answer

Schemas contains Databases   Databases are part of a Schema   So  schemas   databases   Schemas contains views  stored procedure s   database s   trigger s  etc

User · Answer

A schema is not a plan for the entire database  It is a plan container for a subset of objects  ex tables  inside a a database    This goes to say that you can have multiple objects ex  tables  inside one database which don t neccessarily fall under the same functional category  So you can group them under various schemas and give them different user access permissions    That said  I am unsure whether you can have one table under multiple schemas  The Management Studio UI gives a dropdown to assign a schema to a table  and hence making it possible to choose only one schema  I guess if you do it with TSQL  it might create 2  or multiple  different objects with different object Ids

User · Answer

As MusiGenesis put so nicely  in most databases      schema   database   table    floor plan   house   room   But  in Oracle it may be easier to think of   schema   database   table    owner   house   room

User · Answer

More on schemas   In SQL 2005 a schema is a way to group objects   It is a container you can put objects into   People can own this object   You can grant rights on the schema     In 2000 a schema was equivalent to a user   Now it has broken free and is quite useful  You could throw all your user procs in a certain schema and your admin procs in another   Grant EXECUTE to the appropriate user role and you re through with granting EXECUTE on specific procedures   Nice    The dot notation would go like this   Server Database Schema Object  or  myserver01 Adventureworks Accounting Beans

User · Answer

Schema behaves seem like a parent object as seen in OOP world. so it's not a database itself. maybe this link is useful.

But, In MySQL, the two are equivalent. The keyword DATABASE or DATABASES can be replaced with SCHEMA or SCHEMAS wherever it appears. Examples:

CREATE DATABASE <=> CREATE SCHEMA
SHOW DATABASES <=> SHOW SCHEMAS

Documentation of MySQL

SCHEMA & DATABASE terms are something DBMS dependent.

A Table is a set of data elements (values) that is organized using a model of vertical columns (which are identified by their name) and horizontal rows. A database contains one or more(usually) Tables . And you store your data in these tables. The tables may be related with one another(See here).

User · Answer

In oracle Schema is one user under one database For example scott is one schema in database orcl        In one database we may have many schema s like scott

[database] What is the difference between a schema and a table and a database?

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