Document SHOW CREATE DATABASE on the SHOW page

[javier]

Summary

Documents SHOW CREATE DATABASE (Enterprise 3.3.4 / OSS engine, questdb/questdb#7232) on the SHOW reference page:

• Syntax block with the full { INCLUDE | EXCLUDE } { ALL | (category [, ...]) } grammar and the complete category list (schema: TABLES, VIEWS, MATERIALIZED_VIEWS; access control: USERS, GROUPS, SERVICE_ACCOUNTS, PERMISSIONS; umbrellas: SCHEMA, ACL, ALL).
• Real example output (demo schema) as a one-row-per-object ddl result set.
• Output ordering: objects emitted so a materialized view or view never precedes its base.
• Category filtering with INCLUDE/EXCLUDE, comma-separated categories, and the default (INCLUDE ALL); note that OSS ALL and SCHEMA are equivalent while Enterprise ALL also dumps the ACL block.
• Enterprise ACL section (users, groups, service accounts, memberships, grants, OWNED BY; no credentials).
• Note that row-level WHERE filtering is not yet supported.

Example is marked demo so it runs against the demo instance once the engine there includes the statement.

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