add query for counting databases in a cluster (#1224) (#1233)

Co-authored-by: Jens Pryce-Åklundh <[email protected]>

Author: AlexicaWright

modules/ROOT/pages/database-administration/standard-databases/manage-databases.adoc

@@ -300,13 +300,13 @@ SHOW DATABASE movies YIELD *
 
 === Show the number of databases
 
-The number of databases can be seen using a `count()` aggregation with `YIELD` and `RETURN`.
+The number of distinct databases can be seen using `YIELD` and a `count()` function in the `RETURN` clause.
 
 .Query
 [source, cypher]
 ----
-SHOW DATABASES YIELD *
-RETURN count(*) AS count
+SHOW DATABASES YIELD name
+RETURN count(DISTINCT name) AS count
 ----
 
 .Result
@@ -319,6 +319,9 @@ RETURN count(*) AS count
 +-------+
 ----
 
+By specifying the `name` column and sorting the results by distinct name, only the number of distinct databases are counted, **not** the number of allocations of databases in a clustered environment.
+
+
 === Show the default database
 
 The default database can be seen using the command `SHOW DEFAULT DATABASE`.