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DROP STATISTICS
DROP STATISTICS — remove extended statistics
Synopsis
DROP STATISTICS [ IF EXISTS ] name [, ...]
  Description
DROP STATISTICS removes statistics object(s) from the database. Only the statistics object's owner, the schema owner, or a superuser can drop a statistics object.
Parameters
- 
      
IF EXISTS - 
      
Do not throw an error if the statistics object does not exist. A notice is issued in this case.
 - 
      
name - 
      
The name (optionally schema-qualified) of the statistics object to drop.
 
Examples
To destroy two statistics objects in different schemas, without failing if they don't exist:
DROP STATISTICS IF EXISTS
    accounting.users_uid_creation,
    public.grants_user_role;
  Compatibility
There is no DROP STATISTICS command in the SQL standard.
See Also
ALTER STATISTICS, CREATE STATISTICS© 1996–2019 The PostgreSQL Global Development Group
Licensed under the PostgreSQL License.
 https://www.postgresql.org/docs/10/sql-dropstatistics.html