Add List All The Databases as a postgres til

postgres/list-all-the-databases.md

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+# List All The Databases
+
+There are two ways to list all the available databases. The first is a
+`psql` only command:
+
+```
+\list
+```
+
+The second approach is to query the `pg_database` table. Something like the
+following will suffice:
+
+```sql
+select datname from pg_database;
+```