SHOW POOL_VERSION
Name
SHOW POOL_VERSION --       displays a string containing
      the 
Pgpool-II release number.
    
Synopsis
SHOW POOL_VERSION
    Description
      SHOW POOL_VERSION displays a string
      containing the Pgpool-II release
      number. Here is an example session:
test=# show pool_version;
       pool_version
--------------------------
 3.6.0 (subaruboshi)
(1 row)