CREATE_SCHEMA(7) - phpMan

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CREATE SCHEMA(7)                  PostgreSQL 14.15 Documentation                 CREATE SCHEMA(7)

NAME
       CREATE_SCHEMA - define a new schema

SYNOPSIS
       CREATE SCHEMA schema_name [ AUTHORIZATION role_specification ] [ schema_element [ ... ] ]
       CREATE SCHEMA AUTHORIZATION role_specification [ schema_element [ ... ] ]
       CREATE SCHEMA IF NOT EXISTS schema_name [ AUTHORIZATION role_specification ]
       CREATE SCHEMA IF NOT EXISTS AUTHORIZATION role_specification

       where role_specification can be:

           user_name
         | CURRENT_ROLE
         | CURRENT_USER
         | SESSION_USER

DESCRIPTION
       CREATE SCHEMA enters a new schema into the current database. The schema name must be
       distinct from the name of any existing schema in the current database.

       A schema is essentially a namespace: it contains named objects (tables, data types,
       functions, and operators) whose names can duplicate those of other objects existing in
       other schemas. Named objects are accessed either by "qualifying" their names with the
       schema name as a prefix, or by setting a search path that includes the desired schema(s).
       A CREATE command specifying an unqualified object name creates the object in the current
       schema (the one at the front of the search path, which can be determined with the function
       current_schema).

       Optionally, CREATE SCHEMA can include subcommands to create objects within the new schema.
       The subcommands are treated essentially the same as separate commands issued after
       creating the schema, except that if the AUTHORIZATION clause is used, all the created
       objects will be owned by that user.

PARAMETERS
       schema_name
           The name of a schema to be created. If this is omitted, the user_name is used as the
           schema name. The name cannot begin with pg_, as such names are reserved for system
           schemas.

       user_name
           The role name of the user who will own the new schema. If omitted, defaults to the
           user executing the command. To create a schema owned by another role, you must be a
           direct or indirect member of that role, or be a superuser.

       schema_element
           An SQL statement defining an object to be created within the schema. Currently, only
           CREATE TABLE, CREATE VIEW, CREATE INDEX, CREATE SEQUENCE, CREATE TRIGGER and GRANT are
           accepted as clauses within CREATE SCHEMA. Other kinds of objects may be created in
           separate commands after the schema is created.

       IF NOT EXISTS
           Do nothing (except issuing a notice) if a schema with the same name already exists.
           schema_element subcommands cannot be included when this option is used.

NOTES
       To create a schema, the invoking user must have the CREATE privilege for the current
       database. (Of course, superusers bypass this check.)

EXAMPLES
       Create a schema:

           CREATE SCHEMA myschema;

       Create a schema for user joe; the schema will also be named joe:

           CREATE SCHEMA AUTHORIZATION joe;

       Create a schema named test that will be owned by user joe, unless there already is a
       schema named test. (It does not matter whether joe owns the pre-existing schema.)

           CREATE SCHEMA IF NOT EXISTS test AUTHORIZATION joe;

       Create a schema and create a table and view within it:

           CREATE SCHEMA hollywood
               CREATE TABLE films (title text, release date, awards text[])
               CREATE VIEW winners AS
                   SELECT title, release FROM films WHERE awards IS NOT NULL;

       Notice that the individual subcommands do not end with semicolons.

       The following is an equivalent way of accomplishing the same result:

           CREATE SCHEMA hollywood;
           CREATE TABLE hollywood.films (title text, release date, awards text[]);
           CREATE VIEW hollywood.winners AS
               SELECT title, release FROM hollywood.films WHERE awards IS NOT NULL;

COMPATIBILITY
       The SQL standard allows a DEFAULT CHARACTER SET clause in CREATE SCHEMA, as well as more
       subcommand types than are presently accepted by PostgreSQL.

       The SQL standard specifies that the subcommands in CREATE SCHEMA can appear in any order.
       The present PostgreSQL implementation does not handle all cases of forward references in
       subcommands; it might sometimes be necessary to reorder the subcommands in order to avoid
       forward references.

       According to the SQL standard, the owner of a schema always owns all objects within it.
       PostgreSQL allows schemas to contain objects owned by users other than the schema owner.
       This can happen only if the schema owner grants the CREATE privilege on their schema to
       someone else, or a superuser chooses to create objects in it.

       The IF NOT EXISTS option is a PostgreSQL extension.

SEE ALSO
       ALTER SCHEMA (ALTER_SCHEMA(7)), DROP SCHEMA (DROP_SCHEMA(7))

PostgreSQL 14.15                               2024                              CREATE SCHEMA(7)

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