urQL/docs/drop.md

DROP DATABASE [ FORCE ] <database-name>

Discussion:
Only succeeds when no populated tables exist in it unless FORCE is specified.

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DROP INDEX <index-name>
  ON [ <db-qualifer> ] { <table-name> | <view-name> }

Discussion: Cannot drop indices whose names begin with "pk-", as these are table primary keys.

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DROP NAMESPACE [ FORCE ] [ <database-name>. ]<namespace-name>

Discussion: Only succeeds when no tables or views are in the namespace, unless FORCE is specified, possibly resulting in cascading object drops described in DROP TABLE.

Cannot drop namespaces dbo and sys.

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DROP TABLE [ FORCE ] [ <db-qualifer> ] { <table-name> }

Discussion: Cannot drop if used in a view or foreign key, unless FORCE is specified, resulting in cascading object drops.

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DROP TRIGGER
  [ <db-qualifer> ] { <trigger-name> }
  ON { <table-name> | <view-name> }

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DROP TYPE <type-name> TBD

Discussion: Cannot drop if type-name is in use.

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DROP VIEW [ <db-qualifer> ] <view-name>

Discussion: Cannot drop if view is in use by another view,