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The Lounge What is on Your Mind? Movie Screenshot Contest - Bits to be won! Post 302373736 by Smiling Dragon on Saturday 21st of November 2009 05:06:55 PM
Old 11-21-2009
Update:
I'm back from holiday but still having trouble with the awards for pludi - you've got 50k or the 60k prize - expect the remaining 10k as soon as I can convince the forum software to let me send it Smilie
 
Test Your Knowledge in Computers #249
Difficulty: Easy
Senator Albert Gore, Jr. authored the High Performance Computing and Communication Act of 1991, creating what Gore referred to as the information superhighway.
True or False?

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CREATE 
SCHEMA(7) SQL Commands CREATE SCHEMA(7) NAME
CREATE SCHEMA - define a new schema SYNOPSIS
CREATE SCHEMA schemaname [ AUTHORIZATION username ] [ schema_element [ ... ] ] CREATE SCHEMA AUTHORIZATION username [ schema_element [ ... ] ] 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
schemaname 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. username The name of the user who will own the schema. If omitted, defaults to the user executing the command. Only superusers can create schemas owned by users other than themselves. 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. 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 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 his schema to someone else. SEE ALSO
ALTER SCHEMA [alter_schema(7)], DROP SCHEMA [drop_schema(7)] SQL - Language Statements 2010-05-14 CREATE SCHEMA(7)

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