<database>=# create extension rum;ERROR:  operator % already exists<database>=# select version();                                                                   version--------------------------------------------------------------------------------------------------------------------------------------------- PostgreSQL 11.5 (Ubuntu 11.5-1.pgdg16.04+1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 5.4.0-6ubuntu1~16.04.11) 5.4.0 20160609, 64-bit<database>=# \dx                                                                     List of installed extensions         Name         | Version |     Schema     |                                                     Description----------------------+---------+----------------+--------------------------------------------------------------------------------------------------------------------- address_standardizer | 2.4.7   | public         | Used to parse an address into constituent elements. Generally used to support geocoding address normalization step. adminpack            | 2.0     | pg_catalog     | administrative functions for PostgreSQL aggs_for_arrays      | 1.3.2   | public         | Various functions for computing statistics on arrays of numbers aggs_for_vecs        | 1.2.1   | public         | Various functions for computing statistics on vectors (arrays) of numbers btree_gin            | 1.3     | public         | support for indexing common datatypes in GIN btree_gist           | 1.5     | public         | support for indexing common datatypes in GiST cstore_fdw           | 1.6     | public         | foreign-data wrapper for flat cstore access cube                 | 1.4     | public         | data type for multidimensional cubes dblink               | 1.2     | public         | connect to other PostgreSQL databases from within a database file_fdw             | 1.0     | public         | foreign-data wrapper for flat file access floatvec             | 1.0.1   | public         | Math for vectors (arrays) of numbers hll                  | 2.12    | public         | type for storing hyperloglog data http                 | 1.3     | public         | HTTP client for PostgreSQL, allows web page retrieval inside the database. madlib               | 1.16.0  | madlib         | A scalable in-database analytics library multicorn            | 1.3.4   | public         | Multicorn Python bindings for Postgres 9.2.* Foreign Data Wrapper pg_buffercache       | 1.3     | public         | examine the shared buffer cache pg_cron              | 1.1     | public         | Job scheduler for PostgreSQL pg_similarity        | 1.0     | public         | support similarity queries pg_stat_statements   | 1.6     | public         | track execution statistics of all SQL statements executed pg_trgm              | 1.4     | public         | text similarity measurement and index searching based on trigrams pgl_ddl_deploy       | 1.6     | pgl_ddl_deploy | automated ddl deployment using pglogical pglogical            | 2.2.2   | pglogical      | PostgreSQL Logical Replication pgstattuple          | 1.5     | public         | show tuple-level statistics plpgsql              | 1.0     | pg_catalog     | PL/pgSQL procedural language plpython2u           | 1.0     | pg_catalog     | PL/Python2U untrusted procedural language plpython3u           | 1.0     | pg_catalog     | PL/Python3U untrusted procedural language plpythonu            | 1.0     | pg_catalog     | PL/PythonU untrusted procedural language pltclu               | 1.0     | pg_catalog     | PL/TclU untrusted procedural language postal               | 1.0     | public         | Postal address normalizer. postgis              | 2.4.7   | postgis        | PostGIS geometry, geography, and raster spatial types and functions quantile             | 1.1.5   | public         | Provides quantile aggregate function. smlar                | 1.0     | public         | compute similary of any one-dimensional arrays tsm_system_time      | 1.0     | public         | TABLESAMPLE method which accepts time in milliseconds as a limit